pottersheep
Pleaseeee help, Grade 12!
If x^3 - 4x^2 +kx =0
what value of k would result in two equal roots?
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josiahh
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x(x^2-4x+k)=0
16-4k=0 so k=4
pottersheep
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thank you so much
josiahh
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np
pottersheep
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sorry where did 16 -4k come from?
josiahh
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b-sqrt(b^2-4ac)... that formula. so b^2-4ac=4^2-4k.
as you can see, you can factor out an x to get a quadratic equation, use the quadratic formula to solve that equation and there you go :)
pottersheep
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oooo thanks!