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A level maths assistance

im unsure how to solve some problems. If anyone is up to helping me, please let me know.

Thank you!
Original post by SmileyChap
im unsure how to solve some problems. If anyone is up to helping me, please let me know.

Thank you!


Exactly what problems do you need help with? I don't provide final answers (that would be too easy!), but I'll happily go through working/methods.
Reply 2
Avatar for MR1999
MR1999
21
Original post by SmileyChap
im unsure how to solve some problems. If anyone is up to helping me, please let me know.

Thank you!


Post your problems on here and I'm sure someone will help!
Reply 3
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Shaanv
17
Ill help if i can. Just need to know what u need help with
Reply 4
Avatar for SmileyChap
SmileyChap
OP
16
To rationalise 1/(sqrt2+sqrt3+sqrt5),

Do I multiply that fraction by (sqrt2-sqrt3-sqrt5) /(sqrt2-sqrt3-sqrt5)

Is that the correct thing to do?
Reply 5
Avatar for Notnek
Notnek
21
Original post by SmileyChap
To rationalise 1/(sqrt2+sqrt3+sqrt5),

Do I multiply that fraction by (sqrt2-sqrt3-sqrt5) /(sqrt2-sqrt3-sqrt5)

Is that the correct thing to do?

Yes that sounds like a good first step.

If you write it like this

12+(3+5)\displaystyle \frac{1}{\sqrt{2} + (\sqrt{3}+\sqrt{5})}

Then multiplying top and bottom by 2−(3+5)\sqrt{2} - (\sqrt{3}+\sqrt{5}) feels like the right thing to do.


@SmileyChap where did you get this question from out of interest since it isn't a standard A Level surds question?
(edited 6 years ago)
Reply 6
Avatar for SmileyChap
SmileyChap
OP
16
Original post by Notnek
Yes that sounds like a good first step.

If you write it like this

12+(3+5)\displaystyle \frac{1}{\sqrt{2} + (\sqrt{3}+\sqrt{5})}

Then multiplying top and bottom by 2−(3+5)\sqrt{2} - (\sqrt{3}+\sqrt{5}) feels like the right thing to do.


@SmileyChap where did you get this question from out of interest since it isn't a standard A Level surds question?


That looks like the right way to go. Thank you ^-^

It was given to me by my further maths teacher (I've just started this September)
Original post by SmileyChap
To rationalise 1/(sqrt2+sqrt3+sqrt5),

Do I multiply that fraction by (sqrt2-sqrt3-sqrt5) /(sqrt2-sqrt3-sqrt5)

Is that the correct thing to do?


You can do it that way.

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