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Show √20 / (√5 + 1 ) can be written as 10/(5+ √5)

Here is my working :

441ADC03-2459-4578-AEA1-D26E7FFA1DC3.jpeg
I don’t know what to do next.
If you times the top and bottom of the original fraction both by root 5 then you should get what your looking for
Reply 2
Original post by LiechtensteinMAN
If you times the top and bottom of the original fraction both by root 5 then you should get what your looking for

Makes sense now. Thanks.

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