Thread: rationalise

i need to rationalise the denominators of this

can someone explain what i need to do?

Multiply by to change the denominator to an integer.

Originally Posted by Archie Meade

Multiply by to change the denominator to an integer.

i was gonna post because i thought it was that, so the answer would be

yes, but do you need the 1?

Yes, that's it,

beyond that,
you would use the "surd conjugate" when the denominator is
composed of an integer and square root....

example

Originally Posted by VonNemo19

yes, but do you need the 1?

no!!!

understand that rationalise the denominator means to change the denominator so that it is a rational number (i.e. no surds!)

some people rote learn maths and decide to multiply top and bottom by the denominator, which is obviously not the case, as sometimes you need to multiply by the surd conjugate.
so yeah