Question

What is the answer for this question?

Answer 1

a) x^2+16x+63

b) x^2-x-72

c) x^2-16x+63

Explanation:

For a, b, and c, we expand we multiply all the numbers.

a) (x+7)(x+9)=x*x+7*x+9*x+7*9=x^2+16x+63

b) (x+8)(x-9)=x*x+8*x-9*x-9*8=x^2-x-72

c) (x-7)(x-9)=x*x-7*x-9*x+(-7*-9)=x^2-16x+63