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27 November, 16:01

Which is the solution t other equation (x-2) (x+5) = 18

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  1. 27 November, 16:11
    0
    (x-2) (x+5) = 18

    x²-2x+5x-10 = 18

    x² + 3x - 28 = 0 - 28 = 7 * (-4), 3=7 + (-4)

    (x+7) (x-4) = 0

    x = - 7, x=4
  2. 27 November, 16:25
    0
    (x-2) (x+5) = 18

    //expand expression

    x² - 2x + 5x - 10 = 18

    //combine like terms

    x² + 3x - 10 = 18

    //Take away 18 from both sides

    x² + 3x - 28 = 0

    //factorise x² + 3x - 28

    (x + 7) (x - 4) = 0

    //apply zero product property

    x + 7 = 0 or x - 4 = 0

    //Evaluate

    x = - 7 or x = 4

    Answer: x = - 7 or 4
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