Question

1 using identities , find the following products .
(2a+7b)² ​

Answer 1

Answer:

Using the identity is (x−y)

2

=x

2

+y

2

−2xy.

Consider (4a−7b)

2

−(3a)

2

we apply the above identity as follows:

(4a−7b)

2

−(3a)

2

=[(4a)

2

+(7b)

2

−(2×4a×7b)]−9a

2

=16a

2

+49b

2

−56ab−9a

2

=7a

2

+49b

2

−56ab

=7(a

2

+7b

2

−8ab)

Hence, (4a−7b)

2

−(3a)

2

=7(a

2

+7b

2

−8ab).

Step-by-step explanation:

Answer 2

hope it will help u

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