Find following products: (7 a+9 b)(7 a+9 b) - Vidyadip

Question

Find following products:
$(7 a+9 b)(7 a+9 b)$

✓

Answer

$=(7 a+9 b)^2$
$=(7 a)^2+(9 b)^2+2 \times 7 a \times 9 b$
$=49 a^2+81 b^2+126 a b$

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