Question

Using the identity (x+a)(x+b) = x²+x(a+b)+ab, Find the product

(x+3)(x +7).​

Answer 1

x+3)(x-7)

= (xx) + (x-7) + (x3) + (3-7)

= x^2 - 7x + 3x - 21

= x^2 - 4x - 21