If x2 + 16 = -4x then what is the value...

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If x² + 16 = -4x, then what is the value of x³ - 64?

A. 128

B. 0

C. 64

D. 256

Answer: Option B

x² + 16 = -4x
x³ - 64
= x³ - (4)³
= (x - 4)(x² + 16 + 4x)
= (x - 4)(-4x + 4x)
= 0

This Question Belongs to Arithmetic Ability >> Algebra

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