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20 April, 05:44

What number must you add to complete the square x^2+2x=13

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  1. 20 April, 07:34
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    You must halve the linear coefficient and then square it. In this case:

    (2/2) ^2=1 so you must add 1 to both sides of the equation ...

    x^2+2x+1=14 now the left side is a perfect square ...

    (x+1) ^2=14
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