Question

considerando a função f(x)=x²-x-20 determine f(8)

Answer 1

 f(x)=x²-x-20

 f(8)=8²-8-20

f(8)=64-28=36

Answer 2

f(8)= 8^2-8-20
f(8)= 64-28
f(8)= 36