business math college

Question

Suppose f(x)=−x2+9x−5f(x)=-x2+9x-5. Compute the following:

A.) f(−1)+f(1)=f(-1)+f(1)= 

B.) f(−1)−f(1)=f(-1)-f(1)= 

Answer 1

f(x) = -x^2 +9x -5

f(1) = 3

f(-1) = 5

f(-1)+f(1) =5+3= 8

f(-1)-f(1) =5-3 = 2