Question

Find the product by using a suitable identity. 1.(x-9) (x+7)









​

Answer 1

Answer:

(x - 9) (x + 7)

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

here, a = -9 and b= 7

= x^2+(-9+7) x +(-9× 7)

= x^2 -9x +7x -63

= x^2 -2x -63

Answer 2

Answer:

Step-by-step explanation:

(x-9)(x+7)

Identiy is (x+a)(x+b)=x²+(a+b)x+(ab)

On substitution,

x²+(-9+7)x+(-9*7)

x²+-9x+7x+(-63)

x²+-2x-63

Hope it usey✌️✌️✌️