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25 February, 00:29

X^2+8x+c

Perfect square Trinomial

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Answers (1)
  1. 25 February, 03:48
    0
    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

    c=16

    Answer: c=16
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