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Algebraic Expressions — Maths STD 7 — Question

Maharashtra BoardEnglish MediumSTD 7MathsAlgebraic Expressions2 Marks
Question
Find the following product: 
$(9 x+5 y)(4 x+3 y)$
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Answer

$(9 x+5 y)(4 x+3 y)$
$=9 x(4 x+3 y)+5 y(4 x+3 y)$
$=(9 x \times 4 x+9 x \times 3 y)+(5 y \times 4 x+5 y \times 3 y)$
$=36 x^2+27 x y+20 x y+15 y^2$
$=36 x^2+47 x y+15 y^2$ ​​​​​​​

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