Solve t 4 − 17 t 2 + 16 = 0

Question

List them separated by commas, for example: 2 3 , 5 2 , √ 5 , − √ 5 type "2/3,5/2, sqrt(5),-sqrt(5)"

Answer 1

t^4 -17t^2 + 16 = 0

let x = t^2

x^2 -17x + 16 =0

(x-16)(x-1) = 0

x = 1, 16

t = + or - sqrx = -1. 1, -4. 4

four solutions.