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pottersheep

  • 3 years ago

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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  1. josiahh
    • 3 years ago
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    x(x^2-4x+k)=0 16-4k=0 so k=4

  2. pottersheep
    • 3 years ago
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    thank you so much

  3. josiahh
    • 3 years ago
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    np

  4. pottersheep
    • 3 years ago
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    sorry where did 16 -4k come from?

  5. josiahh
    • 3 years ago
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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 :)

  6. pottersheep
    • 3 years ago
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    oooo thanks!

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