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college algebra

posted by on .

y intercept:
3x^2+18x

0=3x^2+18x

from here im lost

  • college algebra - ,

    what do you want to do?
    solve it ?
    find the y-intercept ?

  • college algebra - ,

    yes find y intercept

  • college algebra - ,

    then let x = 0
    so y = 3(0) + 18(0) = 0

    the y-intercept is 0, the line runs through the origin.

  • college algebra - ,

    sorry i meant the x intercept

  • college algebra - ,

    x intercept:
    y = 3x^2+18x
    0 = 3x^2+18x

    3x is common to both terms on the right: factor it out.

    0 = 3x(x + 6)

    If 2 values are multiplied together and the product is 0, then one or both of the values must be 0.

    3x = 0 and/or x + 6 = 0

    Take it from there.

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