Question

use the identity ( x+a ) (x+b)=x square+(a+b). to find the product of (x+3) (x+7)​

Answer 1

$(x+a)(x+b) = x² + (a+b)x + ab$

Using the formula , we get

$(x+3)(x+7) \\\\\ \implies x²+(3+7)x + (3)(7) \\\\\ \implies x²+10x+21$