Question

Use suitable identity to find the following product: (x-4)(x+7)​

Answer 1

Answer:

$x^2+3x-28$

Step-by-step explanation:

[x+a][x+b]= $x^2+(a+b)x+ab$

here a=(-4) b=7

(x-4)(x+7)​=$x^2+[-4+7]x+(-4)(7)$

               =$x^2+[3]x+[-28]$

                = $x^2+3x-28$