Question

F (x) =2x -4; find f (-4)

Answer 1

`\longmapsto \: f(x) = 2x - 4 \\ f( - 4) = 2( - 4) - 4 \\ f( - 4) = - 8 - 4 \\ \boxed{f( - 4) = - 12}✓`

• 12 is the right answer.

Answer 2

f(-4) = -12

Explanation:

`f(x)=2x-4`

To calculate f(-4), we need to substitute x in our equation above with -4:

`f(x)=2x-4\\f(-4) = 2*(-4) - 4\\f(-4) = -8-4 = -12`

Note that 2*(-4) = -8

Answer: f(-4) = -12