evaluate using suitable identities (i) (2a+7)(2a-7)
(ii) (b-7)²
Answers
Answered by
1
- (a+b)(a-b) = a² - b²
=> (2a)² - (7)² = 4a² - 49
Answered by
2
a. (2a+7)(2a-7)
= (2a)²-(7)²
= 4a²-49
b. (b-7)²
= b²+7²-14b
= b²+49-14b
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