Question

Solve x4 − 4x2 − 12 = 0.

Answer 1

x=6

Explanation:

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Answer 2

x^2+2=0 or x^2−6=0

Explanation:

x^4-4x^2-12=0

(x^2+2)(x^2−6)

x^2+2=0 or x^2−6=0