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Algebraic Expressions and Identities — Maths STD 8 — Question

Maharashtra BoardEnglish MediumSTD 8MathsAlgebraic Expressions and Identities3 Marks
Question
Multiply:
$(7 x+y) \text { by }(x+5 y)$
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Answer

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

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