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Identities — MATHS STD 8 — Question

ICSE BoardEnglish MediumSTD 8MATHSIdentities4 Marks
Question
Expand: $\left(2 \mathrm{x}-\frac{1}{2 \mathrm{x}}\right)^2$
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Answer

$ \left(2 \mathrm{x}-\frac{1}{2 \mathrm{x}}\right)^2$
$=(2 \mathrm{x})^2+\left(\frac{1}{2 \mathrm{x}}\right)^2-2 \times 2 \mathrm{x} \times \frac{1}{2 \mathrm{x}}$
$ =4 \mathrm{x}^2+\frac{1}{4 \mathrm{x}^2}-2$

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