# Higher Maths Equal RootsWatch

#1
Hey all.

Having a bit of trouble with a Higher maths question - any help would be great.

I don't know how to use "Mathsspeak" so as a substitute i'll write the problem out in english.

Question: For what value of K does the equation x^2 - 3x + k = 0 have equal roots?

English = For what value of K does the equation X squared take away 3x plus K have equal roots?

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9 years ago
#2
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9 years ago
#3
Equal roots occur when the "discriminant" is equal to zero.

For a quadratic equation ax^2 + bx + c = 0, the discriminant is given by (b^2 - 4ac)

So you need to work out the value of k for which (-3)^2 - 4k = 0
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#4
Ahhh god. Right, thats so easy. Thanks peeps.
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