Question

expand (3x-1/2y)^2. ​

Answer 1

9x^2-1/4y^2.............

Answer 2

$( {}^{} \frac{3x }{2y} - \frac{1}{2y} ) {}^{2}$

Using the identity (a-b)^2 = a^2 +b^2 -2ab

$(\frac{3x}{2y} ) {}^{2} + ( \frac{1}{2y} ) {}^{2} - 2( \frac{3x}{2y})( \frac{1}{2y)}$

$\frac{9x {}^{2} }{4y {}^{2} } + \frac{1}{4y {}^{2} } - \frac{3x}{2y {}^{2} }$

hope it helps

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