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20 January, 11:14

Solve the radical equation. x+1 = square root of - 6x-6

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  1. 20 January, 11:36
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    Step-by-step explanation:

    Step1: isolate the square root on the left hand side.

    Original equation : x+1=√-6x-6

    Isolate : x+1=√-6x-6.

    Step2: raise both sides to the second power.

    (x+1) ^2 = (√-6x-6) ^2

    (x+1) (x+1) = -6x-6

    Step3: after squaring, solve the quadratic equation.

    x^2+2x-1=-6x-6

    x^2+8x+7=0

    x^2+7x+x+7=0

    x (x+7) + 1 (x+7) = 0

    (x+1) (x+7) = 0

    x=-1,-7

    Step4:check that the first solution correct.

    Input x=-1 into the original equation

    x+1=√-6x-6

    -1+1=√+6-6

    0=0

    Step5:check that the second equation is correct.

    Input x=-7 into the original equation

    x+1=√-6x-6

    -7+1=√42-6

    -6=√36

    -6#6

    Therefore one solution is found.

    x=-1
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