algebra

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Write each equation in standard form (set equal to zero). Then solve by factoring.

Example:

x²-2x=8

  • algebra -

    X^2 -2X = 8
    In "set to zero" form:
    X^2 - 2X - 8 = 0
    factoring:
    (X + ?) * (X + ?) = 0
    The two different numbers that are question marks must equal 8 when multiplying them together. This would suggest trying:
    1, 8
    or 2, 4
    Since 8 is negative, one of the values must be negative.
    The first factor is:
    (X - 4)
    So...
    (X - 4) * (X + ?)
    You can get the second factor easily from that.

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