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Talha Rafique · Answer 1 · 2018-07-27T15:08:05+0000

$\bf \cfrac{-7x^2}{√(6x-6)}\cdot \cfrac{√(6x-6)}{√(6x-6)}\implies \cfrac{-7x^2√(6x-6)}{√((6x-6)^2)}\implies \cfrac{-7x^2√(6x-6)}{6x-6}$

the idea being, getting rid of the pesky radical at the bottom, simply multiply it by something that'd raise it to the root, so it gets out :)

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