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# factorise x^2-49

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Why bother with a post grad? Are they even worth it? Have your say! 26-10-2016
1. the answer is (x-7) (x+7) but is it correct if you write (x-7)^2
2. Edit: You're wrong mate
3. (Original post by _Xenon_)
Yes that is the same thing
edit:i know
thanks anyway
4. (Original post by D.SHA64)
the answer is (x-7) (x-7) but is it correct if you write (x-7)^2
No (x+7)(x-7)
5. (Original post by D.SHA64)
the answer is (x-7) (x-7) but is it correct if you write (x-7)^2
(Original post by _Xenon_)
Yes that is the same thing
6. first of all its (x-7) (x+7)
and when you expand it you get x2-49
7. (Original post by D.SHA64)
the answer is (x-7) (x-7) but is it correct if you write (x-7)^2
If it were (x-7)(x-7) then it is the same as (x-7)^2 - however, it is not (x-7)^2 in this case. (x-7)^2 gives x^2 - 14x + 49 when expanded.
8. (Original post by undercxver)
However yes (x-7)(x-7)=(x-7)2
Or use difference of two squares.
9. (Original post by D.SHA64)
the answer is (x-7) (x-7) but is it correct if you write (x-7)^2
Shouldn't the answer be (x + 7) (x -7). Your answer is wrong so you can't use any of those you wrote.
10. (Original post by Zacken)
I was actually waiting for your response to this
11. (Original post by D.SHA64)
the answer is (x-7) (x-7) but is it correct if you write (x-7)^2
That's not correct, as that would expand to be x^2 - 14x + 49. The correct answer is (x-7) (x+7)
12. (Original post by D.SHA64)
thanks
it didnt say anything the mark scheme so i was just wondering
It edit
13. (Original post by ozzie2)
That's not correct, as that would expand to be x^2 - 14x + 49. The correct answer is (x-7) (x+7)
yeah your right and everyone else who said it
14. (x-7)^2 would be (x-7)(x-7) so that would be wrong
15. Oh dear. You'd expect the first respondent to correct the OP and close the matter immediately
16. (Original post by Zacken)
Oh yeah sorry, didn't really look at that...
I assumed he was right because he said so and just looked at brackets to say (x-7)(x-7) would mean (x-7)^2

👍

Which is why you don't assume things are correct!!!)
17. (Original post by niv1234)
(x-7)^2 would be (x-7)(x-7) so that would be wrong
That's correct.

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18. (Original post by rosemondtan)
I was actually waiting for your response to this
How come?
19. (Original post by ServantOfMorgoth)
That's correct.

Posted from TSR Mobile
No, it's not. . Look up difference of two squares or factorising polynomials if you're still confused.
20. (Original post by Zacken)
How come?
I saw the thread and the first few comments and I just had this feeling that you would be here to correct it in no time turns out I was right!!

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