Question

If f(x) = 6 – 5x and g(x) = 4x – 1, evaluate f(x) – g(x) for x = –2. A. –11 B. 7 C. 9 D. 25

Answer 1

D. 25

Explanation:

f(x) = 6 – 5x and g(x) = 4x – 1

We want to subtract.

f(x) -g(x)= 6 – 5x -( 4x – 1)

Distribute the minus sign

6 – 5x - 4x + 1

I line them up vertically

– 5x +6

- 4x + 1

-------------------

-9x +7

Now let x = -2

-9(-2) +7

18+7

25