Question

(x + 1)(x-9) + (x + 4)(x + 7).

Expand and simplify (factor) ​

Answer 1

(x+1)(x+9) + (x+4)(x+7)

= x(x+9) +1(x+9) + x(x+7)+ 4(x+7)

=x2 + 9x + x +9 + x2 +7x + 4x + 28

=2x2 + 21 + 37 .