# Help me with a maths question!

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#1
The question I need help with is in the comments section (itβs a photo):
I really donβt understand how to do it, so a step-by-step guide would be useful
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#2
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11 months ago
#3
I wont give you answer but ill give you two big clues.

Think about what a surd^2 makes (Remember what a surd actually is)
Rationalise the denominator by multiplying the surd by something (try to remember what). Clue is its already there for you...
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11 months ago
#4
(Original post by Pinkcurtain)
The question I need help with is in the comments section (itβs a photo):
I really donβt understand how to do it, so a step-by-step guide would be useful
Full solutions are against forum rules - with good reason.

To start, see what you can simplify; the is a good candidate. See if you can extract a factor.
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#5
(Original post by ThirdBack)
I wont give you answer but ill give you two big clues.

Think about what a surd^2 makes (Remember what a surd actually is)
Rationalise the denominator by multiplying the surd by something (try to remember what). Clue is its already there for you...
I got an answer - not sure if itβs right though-
16(1 + β2)
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11 months ago
#6
(Original post by Pinkcurtain)
I got an answer - not sure if itβs right though-
16(1 + β2)
ngl im a bit busy to actually work it out right now, but isnt that a textbook? surely there are answers somewhere.
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11 months ago
#7
(Original post by Pinkcurtain)
I got an answer - not sure if itβs right though-
16(1 + β2)
Agreed.
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#8
(Original post by ThirdBack)
ngl im a bit busy to actually work it out right now, but isnt that a textbook? surely there are answers somewhere.
Oh ok! Nah it was on a test I did and I need to make corrections/redo the questions correctly - so no textbook π
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11 months ago
#9
(Original post by Pinkcurtain)
whenever they ask u questions like these, you want to basically rationalise the denominator. That means that lets say the denominator is in the form β(5 +2), you want to mulitply by β(5 -2) to rationalise it.
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