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Perfect square Trinomial

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  1. 5 June, 08:16
    We know square of the sum formula

    (a+b) ²=a²+2ab+b²

    so we need

    x²+8x+c = (x²+2*4*x+4²) - 16+c = (x+4) ²+c-16,

    so for full square we need c-16=0


    Answer: c=16
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