I need help figuring this out

Question

Evaluate the function f(x)=x^²–7x+ 5 At the given values of the independent variable and simplify.

a. f(-7) b. f(x+7) c. f(–x)

Answer 1

f(x) = x^2 -7x + 5

f(-7) = (-7)^2 -7(-7) + 5 = 49+49+5

= 103

f(x+7) =(x+7)^2 -7(x+7) +5 = x^2 +14x+49-7x-49 +5

= x^2 +7x +5

f(-x) = (-x)^2 -7(-x) +5

= x^2 +7x +5