Find the square of :3a + 7b - Vidyadip

Question

Find the square of :$3a + 7b$

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Answer

We know that
$( a + b )^2 = a^2 + b^2 + 2ab$
$( 3a + 7b )^2 = 9a^2 + 49b^2 + 2 \times 3a \times 7b$
$= 9a^2 + 49b^2 + 42ab$

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