PTĐTNT `G= ( x^2 + x)^2 – 2(x^2 +x ) -15`

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1. G = (x^2 + x)^2 – 2(x^2 + x) – 15

   = (x^2 + x)^2 – 2.(x^2 + x).1 + 1 – 16

   = (x^2 + x – 1)^2 – 4^2

   = (x^2 + x – 1 – 4)(x^2 + x – 1 + 4)

   = (x^2 + x – 5)(x^2 + x + 3)

    

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