Evaluate the following expression for x = 4.

Question

[2( x^3 - 5x ) - x] divide 7
A. 12
B. -2 6/7
C. 1 5/7
D. 10

Answer 1

Let's substitute x = 4 into the expression:
[2(4^3 - 5(4)) - 4] / 7
= [2(64 - 20) - 4] / 7
= [2(44) - 4] / 7
= (88 - 4) / 7
= 84 / 7
= 12

Therefore, the expression evaluates to 12 when x = 4.

The correct option is:
A. 12