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PLEASE HELP PICTURE SHOWN

Rationalize the denominator of the fraction below. What is the new denominator?

PLEASE HELP PICTURE SHOWN Rationalize the denominator of the fraction below. What-example-1

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Your answer is B. 2
This is because to rationalise the denominator, we need to multiply it by (3 - √7), so we get:
(3 + √7)(3 - √7)
3 × 3 = 9
3 × √7 = 3√7
3 × -√7 = -3√7
√7 × -√7 = -7
So all in all you get 9 - 7 which is 2.

I hope this helps!
User Panoptical
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