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Problem 7.14PP Find the characteristic equation for the modal-form matrix Am of Eq. (1a) using Eq. (2). Eq. (la) Eq. (2). det(/r(l — A) = 0. Step-by-step solution step 1 of 1 ■ i r j Characteristic Equation is: det ^ 7 - .4 ]= 0 s 0 0 h:-J r s + 4 0 ] [ 0 S + 3J Characteristic Equation is: (s+4) (s+3) = 0 + 7 5 + 12 ^ 0] step 1 of 1