Question

expand the following
(x+1/y)^3​

Answer 1

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$(x + \frac{1}{y} ) {}^{3} \\ = {(x)}^{2} + {( \frac{1}{y}) }^{2} + 3 \times{x}\times \frac{1}{4}\\ \times (x + \frac{1}{4}) \\ = {x}^{2} + \frac{1}{ {y}^{2} } + \frac{3x}{4} \times (x + \frac{1}{4} ) \\ = {x}^{2} + \frac{1}{ {y}^{2} } + \frac{3 {x}^{2} }{4} + \frac{3x}{16}$

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