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Algebraic Expressions, Identities and Factorisation — MATHS STD 8 — Question

Gujarat BoardEnglish MediumSTD 8MATHSAlgebraic Expressions, Identities and Factorisation2 Marks
Question
Expand the following, using suitable identities.$\Big(\frac{4}{5}\text{a}+\frac{5}{4}\text{b}\Big)^2$
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Answer

$\Big(\frac{4}{5}\text{a}+\frac{5}{4}\text{b}\Big)^2$$=\Big(\frac{4}{5}\text{a}\Big)^2+\Big(\frac{5}{4}\text{b}\Big)^2+2\times\frac{4}{5}\text{a}\times\frac{5}{4}\text{b}$
$=\frac{16}{25}\text{a}^2+\frac{25}{16}\text{b}^2+2\text{ab}$

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