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2 July, 10:20

Zhang Li solves the equation below by first squaring both sides of the equation. - 4=/sqrt{5z+7}-4 = 5z+7 minus, 4, equals, square root of, 5, z, plus, 7, end square root What extraneous solution does Zhang Li obtain?

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  1. 2 July, 13:48
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    z=9/5

    Step-by-step explanation:

    -4 = √ (5z+7)

    squaring both sides of the equation

    (-4) ² = (√ (5z+7)) ²

    16 = 5z+7

    16-7 = 5z

    9=5z

    z=9/5
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