Question

4/√7-√5
Rationalize the denominator

Answer 1

is your question correctly typed

Answer 2

$\huge\boxed{\texttt{\fcolorbox{Red}{aqua}{Hey Mate!!}}}$
$\frac{4}{ \sqrt{7} - \sqrt{5} } \times \frac{ \sqrt{7} + \sqrt{5} }{ \sqrt{7} + \sqrt{5} } \\ = \frac{4 \sqrt{7} + 4 \sqrt{5} }{( \sqrt{7} ) {}^{2} - ( \sqrt{5}) {}^{2} } \\ = \frac{4 \sqrt{7} + 4 \sqrt{5} }{7 - 5} \\ = \frac{4 \sqrt{7} }{2} + \frac{4 \sqrt{5} }{2} \\ = 2 \sqrt{7} + 2 \sqrt{5}$
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