Factorizar polinomios mentalmente

Factoriza mentalmente los polinomios:

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SOLUCIÓN

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– $x^4 - 16 = (x^2-4) \cdot (x^2+4) = (x+2) \cdot (x-2) \cdot (x^2+4)$

– $9x^2-6x^3+x^4 = x^2 \cdot (x-3)^2$

– $2x^2+4x+2 = 2 \cdot (x+1)^2$