Question

Suppose that two times the cube of a number equals 8 times the number. Find the number.

Answer 1

Answer:

1. 2(x^3) = 8x

2x^3 = 8x

2x (x^2) = 8x

(x^2) = 4

x = 2

2. x^2 = 5x

x (x) = 5x

x = 5