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# Surds: Dividing by Negative Numbers Watch

1. (Original post by Mr M)
Wasn't ever unhappy. TenOfThem and I are maths teachers - GCSEs had not been invented when we were at school if that explains the dinosaur reference.
Oh okay, sorry for sounding rude ^^ What level do you teach at?
2. (Original post by TheWantedGuy)
Oh okay, sorry for sounding rude ^^ What level do you teach at?
KS3, GCSE and A Level.
3. Hey,

I've got another question about Surds... if you don't mind helping lol xD

7(sq root of 5) + 15 / 5, can you cancel down the 15 with the 5, to make it: 7(sq root of 5) + 3, or can you only do it when the whole thing is divisible by the denominator, in this case, including 7?

Cheers.
4. (Original post by TheWantedGuy)
Hey,

I've got another question about Surds... if you don't mind helping lol xD

7(sq root of 5) + 15 / 5, can you cancel down the 15 with the 5, to make it: 7(sq root of 5) + 3, or can you only do it when the whole thing is divisible by the denominator, in this case, including 7?

Cheers.
no ... as you say the 7 is not divisible by 5
5. (Original post by TenOfThem)
no ... as you say the 7 is not divisible by 5
Thought so.

Thanks.

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