Question
Multiply:
$(7x + y) by (x + 5y)$

Answer

To multiply, we will use distributive law as follows:
$(7x + y) by (x + 5y)$
$= 7x(x + 5y) + y(x+5y)$
$= 7x^2+ 35xy + xy + 5y^2$
$= 7x^2+ 36xy + 5y^2$
Thus, the answer is $7x^2+ 36xy + 5y^2$.

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