Question

$(x - y \div 5 - 1)(x + y \div 5 + 1$
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Answer 1

Answer:

$( x - y \div 5 - 1)(x + y \div 5 + 1) \\ = \frac{(x - y)}{(5 - 1)} \times \frac{(x + y)}{(5 + 1)} \\ = \frac{(x - y)(x + y)}{(5 - 1)(5 + 1)} \\ = \frac{ {(x)}^{2} - {(y)}^{2} }{ {(5)}^{2} - {(1)}^{2} } \\ = \frac{ {x}^{2} - {y}^{2} }{25 - 1} \\ =\frac{ {x}^{2} - {y}^{2} }{24} \:$

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