Maths GCSE surds help!!!

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Zaspo
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#1
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#1
Does anyone have an easier way of doing these.
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username1986099
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#2
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(Original post by Zaspo)
Does anyone have an easier way of doing these.
Depends what you define as easy, the easiest way I see is using rationalising the denominator methods.

Multiply numerator and denominator by 1-(1/root2) and them simplify down.
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kate426
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#3
Didn't you watch any videos if not watch Primrose kitten she explains things in the simplest way
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Zaspo
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#4
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(Original post by kate426)
Didn't you watch any videos if not watch Primrose kitten she explains things in the simplest way
I know how to do surds but just can,t get my head around this one for some reason.
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ns_2
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(Original post by Zaspo)
I know how to do surds but just can,t get my head around this one for some reason.
Simply the denominator, and then work from there - rationalising the denominator, using the concept of the difference of two squares.
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Zaspo
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(Original post by ns_2)
Simply the denominator, and then work from there - rationalising the denominator, using the concept of the difference of two squares.
Would you be able to post an answer.
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Sinnoh
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#7
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#7
Rationalise the fraction in the denominator to get 1 + \dfrac{\sqrt 2}{2} and multiply the whole fraction by \dfrac{1 - \frac{\sqrt 2}{2}}{1 - \frac{\sqrt 2}{2}}.
Or, if the fractions are what's causing the problems, replace it with 0.5\sqrt(2)
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ns_2
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#8
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(Original post by Zaspo)
Would you be able to post an answer.
Start off by working out this:

1 + \frac{1}{\sqrt{2}} = \frac{?}{\sqrt{2}}
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gerib17
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#9
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#9
Rationalise 1/ root2
Then rationalise again by multiplying by the opposite sign of the fraction
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Zaspo
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#10
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Got it thanks everyone!!! 😂😀
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