(5x+7y+9z)² using identity
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Answer:
refer to attachment
Step-by-step explanation:
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Answer:
25x^2 +49y^2 +81y^2 +70xy+126yz+90xz
Step-by-step explanation:
= 5x^2 + 7y^2 + 9z^2 + 2*5x*7y + 2*7y*9z + 2*5x*9z [ (a+b+c) ^2 =a^2 +b^2 +c^2 +2ab+2bc+2ca]
=25x^2 +49y^2 +81z^2 +70xy+126yz +90xz
(5x+7y+9z)^2= 25x^2 +49y^2 +81z^2 +70xy+126yz+90xz.
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