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4 February, 22:29

Find the value for c, that would make x^2-12x+c, a perfect square

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  1. 4 February, 22:40
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    Complete the square to find the value of this constant:

    4x² + 12x + c = (2x + 3) ²

    4x² + 12x + c = 4x² + 12x + 9

    By comparing coefficients, it is easy to see that c = 9.
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