Question

If f(x) = 2x - 9, which of the following are correct? Select all that apply. f(-3) = 15 f(-1) = -11 f(0) = -9 f(2) = 5 f(3) = -3

Answer 1

f(0)=-9 and f(3)=-3

Explanation:

f(-3)=15 - so to solve this we have to replace x with -3, which would equal:

2(-3)-9=-15. -15 doesn't equal 15, so this is incorrect.

f(-1)=-11 Substitute x for -1: 2(-1)-9=-12. -12 doesn't equal -11, so this is also incorrect.

f(0)=-9 Substitute x for 0. 2(0)-9= -9. -9 does equal -9, so this is correct.

f(2)=5 Substitute x for 2. 2(2)-9=-5. This isn't correct.

f(3)=-3 Substitute x for 3. 2(3)-9=-3. This is also correct because -3 does equal -3.

Hope this helps! :)