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# root numbers question Watch

1. Hi im studying for C1, i came across a question

(1296)^1/4

i know the answer is -+6 through using a calculator, but im just wondering in an exam is there a method anyone could show me to work this out because i obviously wont be able to use a calculator

any help is really appreciated

thanks
2. (Original post by afc_22)
Hi im studying for C1, i came across a question

(1296)^1/4

i know the answer is -+6 through using a calculator, but im just wondering in an exam is there a method anyone could show me to work this out because i obviously wont be able to use a calculator

any help is really appreciated

thanks
Seems quite a strange question for C1 if I'm honest, I wouldn't expect a number quite that high to quad-root (I don't know how to say it properly)

But if you got something like this in the exam, you can pretty much be certain it would be a whole number solution, seeing as it's non-calculator so really all I would advise is trial and error, trying 3, 4, 5 etc and you'd get the solution. That's all I can offer for advice, sorry!
3. Prime factorisation:

4. by the way, the answer is 6 not 6

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Updated: December 1, 2010
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