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Maths C1 Completing the square

    • Thread Starter

    Can someone go over this with me in a easy way? I've been reading it and I somewhat get it but sometimes when I look at answers to questions I'm confused on why it is there, just something like "Do this for a coefficient of x^2" and a way of doing it for something not 1

    here is an example:
    y = 3x2 -12x +1

    y = a( x + b)2 -c

    y = ax2 + 2abx + ab2 - c

    now compare the x2 terms, the x terms and the number terms:
    ====> a = 3

    ====> 2*3*b = -12

    ====> 2*b2 - c = 1*
    • Thread Starter

    I have it now, thanks. The book I'm using just didn't explain it well enough
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