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Operations on Algebraic Expressions — Maths STD 8 — Question

Maharashtra BoardEnglish MediumSTD 8MathsOperations on Algebraic Expressions2 Marks
Question
Find following products:
$\Big(2\text{a}+\frac{3}{\text{b}})(2\text{a}-\frac{3}{\text{b}}\Big)$
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Answer

$\Big(2\text{a}+\frac{3}{\text{b}})(2\text{a}-\frac{3}{\text{b}}\Big)$
$=(2\text{a})^2-\Big(\frac{3}{\text{b}}\Big)^2$
$=4\text{a}^2-\frac{9}{\text{b}^2}$

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