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Considere que x1 e x2 são as raízes da equação do segundo grau (m − 2)x² + (m − 10)x = −16 + 2m, na incógnita x, com m ∈ IR, m ≠ 2 e x1 + x2 = 7. Seja B o valor da expressão m² 3/m2 20m 16/m7 m0 1/m. O número B

a) é primo.
b) é irracional.
c) é quadrado perfeito.
d) tem 12 divisores naturais.
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Matematicamente

há 2 anos

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Ed Verified user icon

há 5 meses

Para resolver essa questão, precisamos primeiro entender a equação do segundo grau dada e as condições sobre as raízes \(x_1\) e \(x_2\). A equação é: \[ (m - 2)x^2 + (m - 10)x + (16 - 2m) = 0 \] Sabemos que a soma das raízes \(x_1 + x_2\) é dada por \(-\frac{b}{a}\), onde \(a = m - 2\) e \(b = m - 10\). Portanto, temos: \[ x_1 + x_2 = -\frac{m - 10}{m - 2} = 7 \] Resolvendo essa equação, podemos encontrar o valor de \(m\). Depois de encontrar \(m\), precisamos calcular o valor da expressão \(B = \frac{m^2 + 20m + 16}{m^7 + m^0 + 1}\). Agora, vamos analisar as alternativas: a) é primo - Para que \(B\) seja primo, ele deve ser um número inteiro maior que 1 que não tem divisores além de 1 e ele mesmo. b) é irracional - Para que \(B\) seja irracional, ele deve ser um número que não pode ser expresso como uma fração de dois inteiros. c) é quadrado perfeito - Um número é quadrado perfeito se ele pode ser expresso como o quadrado de um número inteiro. d) tem 12 divisores naturais - Para determinar isso, precisaríamos fatorar \(B\) e contar os divisores. Sem calcular diretamente, a análise das opções depende do valor de \(m\) que encontramos. Após resolver a equação e calcular \(B\), você deve verificar qual das opções se encaixa no resultado obtido. Se você já tiver o valor de \(B\) ou se precisar de ajuda para calcular, me avise! Caso contrário, a resposta correta não pode ser determinada sem o valor de \(B\).

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Ed Verified user icon

há 2 anos

Para resolver essa questão, podemos utilizar a fórmula de Bhaskara para encontrar as raízes da equação do segundo grau. (m − 2)x² + (m − 10)x = −16 + 2m a = m - 2 b = m - 10 c = -16 + 2m Δ = b² - 4ac Δ = (m - 10)² - 4(m - 2)(-16 + 2m) Δ = m² - 20m + 100 + 8m² - 48m + 64 Δ = 9m² - 68m + 164 Sabemos que x1 + x2 = -b/a e x1 * x2 = c/a. Substituindo os valores, temos: x1 + x2 = -b/a x1 + x2 = -(m - 10)/(m - 2) x1 + x2 = (10 - m)/(m - 2) 7 = (10 - m)/(m - 2) 7m - 14 = 10 - m 8m = 24 m = 3 Agora que encontramos o valor de m, podemos calcular B: B = m² * 3/m² * 20m * 16/m7 * m0 * 1/m B = 3² * 3/2² * 20 * 16/3 * 1/3 B = 27/4 * 320/3 B = 2160/4 B = 540 Portanto, a alternativa correta é a letra E) B é igual a 540.

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BBC Future speaks to three young people who share their Christmas stories. What is Mitzi Jonelle Tan's Christmas tradition and how is it affected by climate change?

Mitzi Jonelle Tan's Christmas tradition is to celebrate from 1 September until 6 January.
People in the Philippines make their own Christmas decorations, including a star-shaped lantern called a parol.
Mitzi Jonelle Tan's family takes photos in front of churches near where her mum grew up on Christmas morning.
The Philippines is the world's most vulnerable country to disasters caused by climate change.
Rising sea levels could cause the special place for the Jonelle Tan family to no longer exist in 50 years' time.
Flooding already means that families can't put up their Christmas lights.
Super typhoon Goni hit the Philippines in November last year, causing severe flooding and large-scale destruction.
Christmas is a celebration of what the community has suffered that year, according to Mitzi Jonelle Tan.
a) Mitzi Jonelle Tan's Christmas tradition is to celebrate from 1 September until 6 January. People in the Philippines make their own Christmas decorations, including a star-shaped lantern called a parol. Mitzi Jonelle Tan's family takes photos in front of churches near where her mum grew up on Christmas morning. The Philippines is the world's most vulnerable country to disasters caused by climate change. Rising sea levels could cause the special place for the Jonelle Tan family to no longer exist in 50 years' time. Flooding already means that families can't put up their Christmas lights. Super typhoon Goni hit the Philippines in November last year, causing severe flooding and large-scale destruction. Christmas is a celebration of what the community has suffered that year, according to Mitzi Jonelle Tan.
b) Salvador Gómez-Colón loves Christmas and says it is the biggest holiday in Puerto Rico. During the festive period, families head into the mountains around the capital San Juan to gather at food trucks, called chinchorros. There they eat suckling pig and cod fritters. One of his favourite Christmas traditions is the parranda: carolling in the streets and outside people's houses. This tradition continued even during Puerto Rico's darkest days, after the country was hit by category 5 Hurricane Maria in 2017. A storm of such power is five times more probable to hit now than in the 1950s due to climate change, a 2019 study found.
c) Daniel Holanda celebrates Christmas in the city of Anápolis in Brazil's central state, Goiás. Christmas starts on 24 November when Brazilians decorate the tree. Every year, Holanda's family gets together on 24 December at his grandma's house. Christmas dinner is often candlelit as the flooding causes frequent power cuts at this time of year. Goiás is home to the Cerrado, a vast wooded savannah that contains thousands of rare species. Scientists have warned that this biodiversity place may collapse in less than 30 years if temperatures continue to rise and large agricultural businesses rapidly change forests into soy plantations. Besides flooding, the region has suffered from extreme drought in recent years. Wildfires are also a major problem there.
d) Mitzi Jonelle Tan's Christmas tradition is to celebrate from 1 September until 6 January. People in the Philippines make their own Christmas decorations, including a star-shaped lantern called a parol. Mitzi Jonelle Tan's family takes photos in front of churches near where her mum grew up on Christmas morning. The Philippines is the world's most vulnerable country to disasters caused by climate change. Rising sea levels could cause the special place for the Jonelle Tan family to no longer exist in 50 years' time. Flooding already means that families can't put up their Christmas lights. Super typhoon Goni hit the Philippines in November last year, causing severe flooding and large-scale destruction. Christmas is a celebration of what the community has suffered that year, according to Salvador Gómez-Colón.

02 - Choose the statement that is in DISAGREEMENT with the text.


a) Brazil and Philippines have a similar impact on their Christmas decoration due to the natural disaster.
b) There have been three different types of climate problems in Brazil recently.
c) Climate change caused so many problems in the three mentioned countries, that celebrations were impacted.
d) The natural disasters happened in the same year in the three mentioned countries.

03 - Choose the option that explains what happened to Salvador Gómez-Colón. During the storm, he could not talk to his dad and friends,


a) then he decided to protect himself in a basement room with 10 others.
b) after that he reached a basement room with 10 others to protect himself.
c) however, he reached a basement room with 10 others to protect himself.
d) because he was protecting himself in a basement room with 10 others.

05 - The word in bold can be omitted in:


a) Active skaters used to enter the Elfstedentocht, an iconic ice-skating race covering 200km that passes through 11 cities in the northern province Friesland.
b) People make their own Christmas decorations, including a star-shaped lantern, called a parol that they hang in windows and streets for the entire festive season.
c) "A few days before Christmas, we were still helping clean up the mud that had flooded the houses”, says Jonelle Tan.
d) Goiás is home to the Cerrado, a vast wooded savannah that contains thousands of rare species.

06 - The main goal of the text is to


a) teach people how to avoid climate change on Christmas season.
b) inform people of the problems caused by climate change in the world.
c) notify the government of their responsibilities in relation to the climate change.
d) relate three different ways to celebrate Christmas in spite of the weather.

07 - Choose the sentence that is INCOHERENT with the idea supported by the author.


a) If the climate keeps changing, holiday traditions will disappear.
b) If the temperature levels were not rising, people could keep their holiday tradit
c) Climate change is affecting Christmas traditions around the world.
d) The impact of climate change on Christmas traditions is not limited to cold regions.

08 - Choose the option that explains the idea of the penultimate paragraph (. 79 to 86).


a) There is a possibility that the biodiversity of Goiás disappear in less than 30 years.
b) It is a fact that, in less than 30 years, Goiás biodiversity will no longer exist.
c) In less than 30 years, there will be a collapse in Goiás biodiversity for sure.
d) Scientists have alerted that, in 2050, Goiás biodiversity is collapsing.

09 - Read the statements related to the text.

I - Elfstedentocht didn’t happen last year.
II - People from Netherlands have been participating in a race covering 200km for 24 years.
III - Dutches at all ages usually ice skate during Christmas season.
IV - The northern province Friesland is the only place that preserves the beloved winter tradition.

The correct sentences are


a) I and II.
b) I and III.
c) II and III.
d) I, III and IV.

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