Question

Which of the following is an even function?

Answer 1

Answer:

An even function is:

f(x) = 7

Step-by-step explanation:

An even function accomplish the following condition:

f(x)=f(-x) (1)

Applying (1), we have:

• f(x)= (x-1)^2 $\neq$ f(-x) $\neq$ (-x-1)^2
• f(x)= 8x $\neq$ f(-x) $\neq$ -8x
• f(x)= x^2 -x $\neq$  f(-x) $\neq$ (-x)^2 +x

• f(x)=7 = f(-x)= 7

The last one is even.