Question

Find the products of (x - 9) (x + 7) by using suitable identities

Answer 1

Answer:

= x^2 -2x -63

Step-by-step explanation:

(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

Hope this is helpful...

Please mark me as a brainlist

Answer 2

The product is $\bf \red{(x - 9)(x + 7) = {x}^{2} - 2x - 63}$

Given:

• $(x - 9)(x + 7)$

To find:

• Find the product using suitable identity.

Solution:

Identity to be used:

$\boxed{\bf (x + a)(x + b) = {x}^{2} + (a + b)x + ab}$

Here,

The expression is

$(x - 9)(x + 7)$

On compare with the identity, it is clear that

$\bf a = - 9$

and

$\bf b = 7$

So,

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

or

$(x - 9)(x + 7) = {x}^{2} + ( - 2)x + ( - 63)$

or

$(x - 9)(x + 7) = {x}^{2} - 2x - 63$

Thus,

The product is $\bf (x - 9)(x + 7) = {x}^{2} - 2x - 63$

Learn more:

1) mn-p,2xy+3z find the product

https://brainly.in/question/47966732

2)find product of (4x+7)(4x-3)

https://brainly.in/question/26397670