Question
Factorise the expression :$49y^2+ 84yz + 36z^2$
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Answer
$49y^2+ 84yz + 36z^2$
$= (7y)^2+ 2(7y) (6z) + (6z)^2$
$= (7y + 6z)^2. . . .[$ Using Identity $I]$
$= (7y)^2+ 2(7y) (6z) + (6z)^2$
$= (7y + 6z)^2. . . .[$ Using Identity $I]$
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