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6 February, 22:35

Solve: (x+5) ^2 = 16

Solve: a^2 + 12a + 36 = 225

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  1. 6 February, 22:41
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    Solve: (x+5) ^2 = 16

    (x+5) ^2 = 16

    x^2 + 10x + 25 - 16 = 0

    x^2 + 10x + 9 = 0

    (x+9) (x+1) = 0

    x + 9 = 0

    x = - 9

    x + 1 = 0

    x = - 1

    answer: x=-1 and x = - 9

    Solve: a^2 + 12a + 36 = 225

    a^2 + 12a + 36 = 225

    a^2 + 12a + 36 - 225 = 0

    a^2 + 12a - 189 = 0

    (a-9) (a+21) = 0

    a - 9 = 0

    a = 9

    a + 21 = 0

    a = - 21

    answer: a = - 21 and a = 9
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