surd (1 Viewer)

[crammy90]

when we are dividing 6 by root6
i dont understand how we can just multiply both num/denominator by root6
dont we normally change the sign when rationalising a surd...

 

[lolman12567]

the purpose of rationalising the denominator is to make the denominator a whole number and multiplying by root6 would give us a whole number.

but when there are 2 terms (1 + root3) we have to multiply it by the conjugate as that gives us a whole number.

 

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回复: surd

when we are dividing 6 by root6
i dont understand how we can just multiply both num/denominator by root6
dont we normally change the sign when rationalising a surd...

You're referring to a fraction with a single term in both the numerator and denominator.
You change the sign during rationalisation only when there is more than one term in the denominator.

 

[crammy90]

thanks guys

 

[VenomP]

Also, it might help to know...

It doesn't affect the value of it, since you are essentially multiplying by 1 to get it to be rational. (root6/root6 = 1)