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# Square root of 9 watch

1. So some mandems are saying that the square root of 9 is +/-3

But i am saying square root of 9 is only 3

But wikipedia saying dat it's +/-3

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2. (Original post by C1 MAY 13)
So some mandems are saying that the square root of 9 is +/-3

But i am saying square root of 9 is only 3

But wikipedia saying dat it's +/-3

Posted from TSR Mobile
+/-3

-3 x -3 =9
3 x 3 = 9
3. You're studying A level maths and you don't know?
4. (Original post by C1 MAY 13)
So some mandems are saying that the square root of 9 is +/-3

But i am saying square root of 9 is only 3

But wikipedia saying dat it's +/-3

Posted from TSR Mobile
http://www.thestudentroom.co.uk/show....php?t=3173187

THE square root of 9 refers to the positive square root. But you can say that both 3 and -3 are square roots of 9. Things become clearer when using the symbol which always refers to the positive square root.
5. (Original post by notnek)
http://www.thestudentroom.co.uk/show....php?t=3173187

THE square root of 9 refers to the positive square root. But you can say that both 3 and -3 are square roots of 9. Things become clearer when using the symbol which always refers to the positive square root.

So 9 to the power half is 3 only?

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6. (Original post by Lissy14)
+/-3

-3 x -3 =9
3 x 3 = 9

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7. (Original post by C1 MAY 13)

So 9 to the power half is 3 only?

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Yes.
8. ... are you annoyed at the answer or at me? XD
9. (Original post by notnek)
Yes.
Thank you

That means that edexcel c1 book is incorrect!
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10. (Original post by Lissy14)
... are you annoyed at the answer or at me? XD
Hehe, no. I am just thinking, that is all

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11. (Original post by C1 MAY 13)
Thank you

That means that edexcel c1 book is incorrect!
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I doubt it. What does the textbook exactly say? Or tell me the page number.
12. (Original post by notnek)
I doubt it. What does the textbook exactly say?
Page 9

It says 9^1/2

Is +/-3
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13. Closed as this thread is redundant due to the magic Sticky.
14. (Original post by notnek)
I doubt it. What does the textbook exactly say? Or tell me the page number.
It really does.

Don't go thinking this is correct though.

The book is wrong.
Attached Images

15. (Original post by BuryMathsTutor)
It really does.

Don't go thinking this is correct though.

The book is wrong.
Good grief. Sticky updated accordingly.

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