Ben says he can write three more equations because he knows 6 + 13 = 19. Is he right or wrong? Tell how you know.

He is right. He could do 13+6=19, 19-6=13 and 19-13=6. So that's how you know he is right.

step-by-step explanation:

to determine whether a given function is even, we simply substitute x with -x in the expression. if the result after simplification is identical to the original equation, then the function is said to be even other wise odd.

f(-x) = (-x)^2 - (-x) + 8

      = x^2 + x +8

the resulting function is not identical to the original one;

f(-x) ≠ f(x)

therefore, f(x) is not an even function