Pinkcurtain
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#1
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The question I need help with is in the comments section (it’s a photo):
I really don’t understand how to do it, so a step-by-step guide would be useful
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Pinkcurtain
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ThirdBack
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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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ghostwalker
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#4
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(Original post by Pinkcurtain)
The question I need help with is in the comments section (it’s a photo):
I really don’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 \sqrt{18} is a good candidate. See if you can extract a factor.
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Pinkcurtain
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(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 it’s right though-
16(1 + √2)
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ThirdBack
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(Original post by Pinkcurtain)
I got an answer - not sure if it’s right though-
16(1 + √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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ghostwalker
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(Original post by Pinkcurtain)
I got an answer - not sure if it’s right though-
16(1 + √2)
Agreed.
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Pinkcurtain
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(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 😅
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Moose3245
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(Original post by Pinkcurtain)
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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 √(5 +2), you want to mulitply by √(5 -2) to rationalise it.
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