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Question

Find the square of $$3a + 7b$$


A
9a2+42ab+49b2
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B
9a2+40ab+49b2
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C
18a2+42ab+98b2
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D
18a2+40ab+98b2
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Solution

The correct option is A $$9a^{2} + 42ab + 49b^{2}$$
Squaring,
$$(3a + 7b)^2$$
$$=(3a)^2+2(3a)(7b)+(7b)^2$$
$$=9a^2+42ab+14b^2$$

Mathematics

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