Question

Given f(x)=-x+2,find f(4)

Answer 1

f(x)=x
2
−4
To find:
f(4)=?

Solution:
f(x)=x
2
−4
or, f(4)=4
2
−4

or, f(4)=16−4

or, f(4)=12

Answer 2

To find f(4), we simply need to substitute 4 for x in the equation for f(x):

f(x) = -x + 2

f(4) = -(4) + 2

f(4) = -2

Therefore, f(4) = -2.

Explanation: