Question

find the products of the following using suitable identity
$(6y + 7) \: ( - 6y + 7)$
​

Answer 1

Answer:-36y square + 49

Step-by-step explanation:6y x -6y = -36y square

7 x 7 = 49

-6y x 7 + 6y x 7 = 0

-36y square + 49 is answer

Answer 2

Answer:

The given expression can be written as

$(7 + 6y)(7 - 6y)$

We need to write the expression in this form to apply The Identity

$(x + y)(x - y) = {x}^{2} - {y}^{2}$

As it is clearly given in the question that applicable of the suitable identity is compulsory otherwise if this condition is not here then we can simply find the product of this but now we have to apply The Identity.

Now using this identity the following expression can be solved as:-

$(7 + 6y)(7 - 6y) = {7}^{2} - {(6y)}^{2} \\ = 49 - 36 {y}^{2}$