Question

(x - 9)( x + 7) . Find the product by using a suitable identity. ​

Answer 1

Answer:

=x^2-2x-63

Step-by-step explanation:

(x+a) (x+b) =x^2+(a+b)x +ab

so,

{x+(-9)}{x+7}=x^2+(-9+7)x +7(-9)

=x^2-2x-63