Question

Rationalise the denominator
A) 7/root2+root2
B)5+root2/5-root2
C)root3+root5/root3-root5

Answer 1

multiply the top by the conjugate.

so for \[\frac{7}{\sqrt{2} + \sqrt{2}}\]

multiple the top and the bottom by

\[\sqrt{2} - \sqrt{2}\]

Answer 2

when I say the top and bottom I mean the numerator and denomoniator

Answer 3

try it, if you have any problems just post them and I will try to assist you

Answer 4

Also as an aside always use the conjugate from the denominator