Q368
If x2 + 16 = -4x, then what is the value of x3 - 64?
A.
128
B.
0
AnswerC.
64
D.
256
Answer: Option B
Solution
Answer: Option B
Solution:
x2 + 16 = -4xx3 - 64
= x3 - (4)3
= (x - 4)(x2 + 16 + 4x)
= (x - 4)(-4x + 4x)
= 0