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1. x^2 + 2Kx -7 =0

i get x= (root k^2-7 ) -k
that seems so wrong
what do you get?
2. x=-k+/-(k^2+7)^1/2
3. (-2k+/-(4k^2+28)^1/2)/2
4. -k±√(k²+7)
5. (Original post by Fermat)
-k±√(k²+7)

Yep, thats the same result as me.
6. I don't get it, what am I doing wrong?
7. (Original post by hitchhiker_13)
I don't get it, what am I doing wrong?

Type out your working and I'll try and see an error. You will probably see what it is when you work through the question again.
8. Is the equation for quadratics not (-b +/- (b^2-4ac)^1/2)/2a?
9. (Original post by hitchhiker_13)
Is the equation for quadratics not (-b +/- (b^2-4ac)^1/2)/2a?

Yes but in this case it's easier to complete the square.
10. (Original post by Ralfskini)
Yes but in this case it's easier to complete the square.

Ah ok, it's actually the same answer, just yours is simpler.
Thanks.

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