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18 April, 17:37

4c^2-8c-1=0 complete the square round to nearest hundredth

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  1. 18 April, 21:04
    0
    Move constant to other side

    add 1

    4c^2-8c=1

    divide by 4 to make leading coeficient 1

    c^2-2c=1/4

    take 1/2 of linear coeficient and square it

    -2/2=-1, (-1) ^2=1

    add that to both sides

    c^2-2c+1=1/4+1

    factor perfect squaer and add

    (c-1) ^2=5/4

    square root both sides

    c-1 = + / - (√5) / 2

    add 1

    c=1 + / - (√5) / 2

    c=2.12 or - 0.12
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