Question

In the function y=2x(4+x)-2, if x=3, what is the value of y?

(i know the answer is 40, i just need help figuring out the step by step process of solving this problem)

Answer 1

Answer: 40

Explanation:

y = 2x (4 + x) - 2

Substitute x with 3:

y = 2(3) (4 + 3) - 2

Simplify:

y = 2(3) (7) - 2

y = 6(7) - 2

y = 42 - 2

y = 40