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# Radical Equation Tweet

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How do I solve this:

2. Square the n on the right side and solve accordingly.

n^2 + n = 110

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3. Re: Radical Equation
(Original post by mattalis)
Square the n on the right side and solve accordingly.

n^2 + n = 110

This was posted from The Student Room's iPhone/iPad App
Attached Images

4. Why have you just reposted it? I've just solved it for you?

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5. Oh you never said it was a quadratic equation.. Yeh that's correct that answer

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6. Re: Radical Equation
(Original post by zed963)
When you square an equation you may generate extra solutions which don't satisfy the original equation.

With this question, when you squared the equation you generated the extra solution n=-11 which can be discounted.
Last edited by notnek; 25-07-2012 at 14:50.
7. Re: Radical Equation
(Original post by mattalis)
Oh you never said it was a quadratic equation.. Yeh that's correct that answer

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It isn't "correct" since the OP gave two solutions and there is only one.
8. Re: Radical Equation
(Original post by Lord of the Flies)
It isn't "correct" since the OP gave two solutions and there is only one.
Solution is 10,

I posted my working including 10 and 11 in the same equation.

I thought it was obvious as to which one is the correct answer therefore I clearly didn't state which one was the correct one.

Sorry for any confusion
9. Re: Radical Equation
(Original post by zed963)

I thought it was obvious as to which one is the correct answer therefore I clearly didn't state which one was the correct one.
Why?

You cannot do that in an exam
10. Re: Radical Equation
(Original post by zed963)
...
As TenOfThem said, even though your corrector knows 10 is the only solution, you have not made it clear that you know this too. Hence my post.