Question

The value of (3a+ 7b)²- (3a-7b)² is ........ *

1 point

0

84ab

21 ab

-84ab

​

Answer 1

$\large{84ab}$

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Answer 2

Answer:

98b^2

Step-by-step explanation:

(3a+ 7b)²- (3a-7b)²

(3a)^2+2(3a)(7b)+(7b)^2-(3a)^2-2(3a)(7b)+(7b)^2

9a^2+42ab+49b^2-9a^2-42ab+49b^2

98b^2