Find all the zeros of the equation. - 4x4 - 44x2 + 3600 = 0

-5, 5, 6i, - 6i

Is 100% correct!

-4X^4 - 44x^2 + 3600 = 0

divide through by - 4:-

x^4 + 11x^2 - 900 = 0

900 = 36 * - 25 and 11 = 36-25 so the factors are

(x^2 + 36) (x^2 - 25) = 0

x^2 = - 36 giving x = 6i and - 6i

x^2 = 25 giving x = 5 and x = - 5

solution set is {-5, 5, 6i, - 6i}