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March 29, 2017

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What the solution of the equation: y^2-3y=9 ?

  • algebra 2 and trigonometry - ,

    y^2-3y=9
    y^2 - 3y = 9
    complete the square
    y^2 - 3y + 9/4 = 9 + 9/4
    (y - 3/2)^2 = 45/4

    +- (y - 3/2) = 45/4

    solve for y
    y = 3/2 (sqrt5 + 1)
    y = -3/2 (-1 + sqrt5)

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