Question

a)Find the following product (x+7)(x+9)​

Answer 1

(x+7)(x+9)

=Identity-(x+a) (x+b) =x²+(a+b) x+ab

=x²+(7+9)x+7×9

=x²+7x+9x+63

=x²+16x+63

Answer 2

$\sf=(x+7)(x+9) \\ \\ \sf=x^2+16x+63 \\ \\\sf=x^2+16x+63$