Rationalising (1 Viewer)

[Aznmichael92]

Hey all, I just encountered a surd question which I have problem rationalising.

It is

1/ (rt2 + rt3 + rt5)

Can someone help me please.

Thanks

 

[ianc]

hi there

i'm assuming you know how to rationalise 1/(x + y) by multiplying the fraction by (x-y)/(x-y)

so this is a messy one, but you do it exactly the same way


and then expand out the denominator, and rationalise again to get your answer

hope this helps!

 

[Aznmichael92]

hi there

i'm assuming you know how to rationalise 1/(x + y) by multiplying the fraction by (x-y)/(x-y)

so this is a messy one, but you do it exactly the same way


and then expand out the denominator, and rationalise again to get your answer

hope this helps!

thanks for that