A)

B)

C)

D)

-12 + -5x2 + 2x4 = 0

Divide this equation by 2

x^4 - 5/2 x^2 - 6 = 0

x^4 - 2.5 x^2 - 6 = 0

x^4 - 2.5 x^2 - 6 + 1.25^2 - 1.25^2 = 0

( x^2 - 1.25 ) ^2 = 7.5625

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