Question

If f(x) = -8 - 5x, what is f(-4)

Answer 1

f(x)=-8-5x

`\\ \rm\longmapsto f(-4)`

• Put -4 inplace of x

`\\ \rm\longmapsto -8-5(-4)`

`\\ \rm\longmapsto -8+20`

`\\ \rm\longmapsto 12`

Answer 2

f(- 4) = 12

Explanation:

To evaluate f(- 4) substitute x = - 4 into f(x) , that is

f(- 4) = - 8 - 5(- 4) = - 8 + 20 = 12