Question

Solve the following according to the given instructions (08) Evaluate using suitableIdentities. 1. (2a + 7) (2a – 7) 2. (b – 7)2 Using Identities, Evaluate the following: 1. 51 2 - 492 2. 103 X 104​

Answer 1

Step-by-step explanation:

1)

So, (2a+7)(2a-7)

Using Identity[a^2+b^2= (a+b)(a-b)]

Therefore,

(2a+7)(2a-7)

=(2a^2+7^2)

=(4a^2+49)

2)So,(b-7)^2

Using Identity[(a-b)^2=a^2-2ab+b^2]

Therefore,

b^2-2(b×7)+7^2

b^2-(14b)+49