Question

If f(x) = 2x² - 4x and g(x) = 5 - 2x, evaluate fx) - g(x) for x = 5.

A 15
B 5
C 35
D. 20
ET

Answer 1

35

Explanation:

2x² - 4x- (5 - 2x)

2x² - 4x - 5 + 2x

2x²-2x - 5 = f(x) - g(x)

Now use 5

`2 ({5}^(2) ) - 2(5) - 5 \\ = 35`