x² -12x + 32 = 0
a = 1 , b = -12 e c = 32
\(Δ = b² - 4ac = (-12)² - 4*1*32 = 16 \)
\(x = {-b \pm \sqrt{Δ} \over 2a} = {12 \pm \sqrt{16} \over 2} = {12 \pm 4 \over 2}\)
\(x1 = (12+4)/2 = 8 ; x2 = (14)/8 = 1 \)
\(Xv = {-b \over 2a } = 12/ 2 = 6 \)
\(Yv = -Δ / 4a = -16/4 = - 4 \)