Question

Using Identities Solve :​

Step By Step plz

Answer 1

(i) (3x+4y)2

$( {3x})^{2} + ( {4y})^{2} + 2 \times 3x \times 4y \\ 9 {x}^{2} + 16 {y}^{2} + 24xy \\ {( \frac{5a }{2} - b})^{2} \\ ( { \frac{5a}{2} }^{2}) + ( {b}^{2} ) - 2 \times \frac{5a}{2} \times b \\ 25 \frac{ {a}^{2} }{4} + {b}^{2} - 5ab$

$( {3.5m})^{2} - ( {1.5n})^{2} \\ 12.25 {m}^{2} - 2.25 {n}^{2} \\ \\ ({7xy})^{2} - (2 + 7) + 2 \times 7 \\ 49 {x}^{2} {y}^{2} - 9 + 14 \\ 49 {x}^{2} {y}^{2} + 5$

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Answer 2

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