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math

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What is The solution set of 2k^2=21k-49 ?

  • math - ,

    this an be arranged to the quadratic
    2k^2 - 21k + 49 = 0
    (2k-7)(k-7) = 0
    k = 7/2 or k-7

  • math - ,

    Thanks! how do u determine that they are both -7 though? Doesn't it have to equal 21? or doesn't that 21 matter?

  • math - ,

    why don't you expand (2k-7)(k-7 to see what you get?

  • math - ,

    oh it makes sense now thanks!

  • math - ,

    what is Expand:-4(2m - 7x + 9)

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