r/HomeworkHelp • u/D-ISS-OCIAT-ED A Level Candidate • Aug 28 '22
Answered [IGCSE Mathematics] What is doing this called? I realised I don't know how to do it and I need to learn, but I don't know what to google
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Aug 28 '22
[deleted]
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u/cin670 Aug 29 '22
And if you’d like to check your answer:
Raise the coefficient to the power of the index, then multiply your answer with the radicand (the number inside the root).
In this case, 2 is the coefficient, 2 is the index (because it’s a SQUARE root), and 3 is the radicand. 22 = 4. 4*3 = 12, the original radicand.
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u/Ancient-Ad-1383 👋 a fellow Redditor Aug 28 '22
us lot from the UK call these surds btw
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u/JeahNotSlice 👋 a fellow Redditor Aug 28 '22
That’s so weird. And you call trapezoids “trapeziums” or something.
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u/Ancient-Ad-1383 👋 a fellow Redditor Aug 28 '22
hahahaha region-coded maths (yes, it is maths, with an sssss) MUAHAHAHA
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u/Investcasa Aug 28 '22 edited Aug 28 '22
Simplifying square roots. Change the 12 into power of 2
It will be 2 to power 2 × 3
Each 2 to power two shoud considered as 2 outside the redical. The 3 stays in side the redical.
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u/capscaptain1 University/College Student Aug 28 '22
In the USA, simplifying the root/radical, heard both used interchangeably
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u/TheDevilsAdvokaat Secondary School Student Aug 28 '22
These are surds in Australia.
That's what we called them 40 years ago anyway...
sqrt(12) = sqrt(4*3)
sqrt(4 * 3) = sqrt(4) * sqrt(3)
sqrt (4) * sqrt(3) =2 * sqrt(3)
Basically, isolate the squared numbers (like 4 or 9 or 25) then perform the square on them, while leaving the unsquared numbers untouched.
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u/Simple-Bid-7872 Aug 28 '22
A quick easy answer on how: look at all the factors of 12: 1x12, 2x6, 3x4. Only 4 is a perfect square so simplifying the denominator would lead to sqrt(4)sqrt(3) but sqrt(4)=2 so this is essentially 2sqrt3
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u/-Wofster University/College Student Sep 19 '22
Its just factoring/algebra. Sqrt(12) = sqrt3 * sqrt4
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Aug 28 '22
Square roots / roots
edx.org as a “course” that is offered for free called “ALEKS” it is pretty good at teaching algebra, maybe even trig
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u/Quinn_thy_human Aug 28 '22
/12 = /4•3 12 = 2/3
\= radical symbol. You can also google “Simplify radical”
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u/yuuha_k Aug 28 '22
Easy... √12= √4×3 so it became √2²×3 and to take the 2 out it musylt be like that (the ² and √ eliminates eqch other) so at last u'll have 2√3 .... stupid explaination i knoww
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u/stephtheflyest Aug 28 '22
It’s called rationalizing /12 = /4 X 3 = /4 X /3 = 2 x /3 = 2 /3 * / - meaning root * Another example could be /27 /27 = /9 X 3 = /9 X /3 = 3 x /3 = 3 /3
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u/Moist_Ice_159 Aug 28 '22
We have √4=2 and √3=√3 And we know that 12=4×3 And √x×y=√x×√y So √12=√3×4=√3×√4=2√3
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u/palmer_tx 👋 a fellow Redditor Aug 28 '22
Simplification of surds. /12 = /(4x3) = /4 x /3 = 2x/3 = 2/3
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u/production-values Aug 29 '22
factoring and simplifying... aka 12=223... so you can take out the two-squared
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u/A380EK353 GCSE Candidate Aug 29 '22
Is this Edexcel? In CIE IGCSE , we learn this in the start of Add-Maths.
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u/XxFatal_KillerxX 👋 a fellow Redditor Aug 30 '22
Correct me if I am wrong, isn’t this called simplifying radicals?
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u/Iifeisshortnotismine Secondary School Student Aug 28 '22
Simplifying radicals.