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Algebra

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Rationalizing Binomial Denominators II

ALGEBR-NNLY6G

If you want to write the expression shown without a radical in the denominator, what should you multiply by?

$$\frac{-3}{(5-\sqrt{7})}$$

A

$5+\sqrt{7}$

B

$5-\sqrt{7}$

C

$\cfrac{(5-\sqrt{7})}{(5-\sqrt{7})}$

D

$\cfrac{(5+\sqrt{7})}{(5+\sqrt{7})}$