Question

Let f(x) = x2 − 8x + 5. Find f(−1).

Answer 1

F(x)=x2-8x+5
=-6x+5
f(-1)= 6(-1)+5
=-6+5
=-1

Answer 2

F(x) = x^2 - 8x + 5

f(-1) = -1^2 - 8(-1) + 5
f(-1) = 1 + 8 + 5
f(-1) = 14 <==