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= (x^2 + 10x +25 )(x^2 + 10x + 25)
= x^4 + 10x^3 + 25x^2 + 10x^3 + 100x^2 + 250x + 25x^2 + 250x + 625
= x^4 + 20x^3 + 150x^2 + 500x + 625