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20 February, 00:09

Solve the equation for all values of x by completing the square.

3x^2-60x+255=0

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Answers (1)
  1. 20 February, 01:47
    0
    x=5 and x=15

    Step-by-step explanation:

    3x^2-60x+225=0

    3x^2-60x+225/3=0/3

    x^2-20x+75=0

    x^2-5x-15x+75=0

    x (x-5) - 15 (x-5) = 0

    (x-5) (x-15) = 0

    x-5=0 x-15=0

    x=5 x=15
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