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3 February, 08:56

Slove this question c^2-81=0

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  1. 3 February, 10:00
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    To solve a square root, get the ^2 on one side and the 81 on the other side.

    add 81 to both sides.

    c^2 = 81

    to clear the power of 2, take the square root of both sides.

    c = + - sqrt81

    c = + - 9

    c = 9 and c = - 9
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