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Math

posted by on .

i forgot how to solve problems like this...

2x^2-18x=0, x^2=6x+7, 6y^2+5y-6=0


also I need help on this one

SOLVE FOR X CORRECT TO 4 DECIMAL PLACES

x^2+6x+2=0 2x+4=3x^2

  • Math - ,

    2x^2-18x=0
    try to factor first
    2x (x-9) = 0
    so x = 0 or x = 9

    x^2=6x+7
    x^2 -6 x - 7 = 0
    (x-7)(x+1) = 0
    so x = 7 or x = -1

    6y^2+5y-6=0
    (6x-1)(x+1) = 0
    x = 1/6 or x = -1

    x^2+6x+2=0
    if you can not factor, complete the square or use the quadratic equation
    x = [ -b +/- sqrt (b^2 - 4 a c) ] / 2a
    x = [ -6 +/- sqrt (36 - 8) ] / 2
    use calculator to 4 places

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