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# C1 question Watch

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1. Can't believe I'm stuck on this question but yh, need help :l

kx^2 +12x + k =0

k = +ve

and it has equal roots

^ I know this means that both values of x are the same but I have no idea how to do it!
2. (Original post by 0range)
Can't believe I'm stuck on this question but yh, need help :l

kx^2 +12x + k =0

k = +ve

and it has equal roots

^ I know this means that both values of x are the same but I have no idea how to do it!
Hint b^2 - 4ac = 0
3. B^2-4ac =

144-4k^2=0

k^2=36

k=6

6x^2+12x+6=0

x^2+2x+1=0

(x+1)^2=0
4. (Original post by zincoff)
B^2-4ac =

144-4k^2=0

k^2=36

k=6

6x^2+12x+6=0

x^2+2x+1=0

(x+1)^2=0

First give hints to the OP, post full solutions as a last resort.
5. (Original post by steve2005)
Hint b^2 - 4ac = 0
Missed that! Thanks!

Updated: May 8, 2012
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