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

This question belongs to Arithmetic Ability Algebra
Algebra
?

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

Answer & Solution
Correct Answer: Option B
x2 + 16 = -4x
x3 - 64
= x3 - (4)3
= (x - 4)(x2 + 16 + 4x)
= (x - 4)(-4x + 4x)
= 0
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