Question

For f(x) = -2x+9,what is x when f(x) = 4

Answer 1

2.5

Explanation:

-2x + 9 = 4

-2x = -5

x = 2.5

Answer 2

when f(x) = 4, the answer is 1

Explanation:

f(x) = -2x + 9

f(4) = -2(4) + 9

= -8 + 9

= 1