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(x+2)(x²-2x+4)
=x³ - 2x² + 4x +2x² - 4x + 8
= x³ +8
=1x³ + 8 = ax³ + b...............comparando, tendremos que:
a=1 y b=8
PIDEN:
√(a+b)=√(1+8)=√9=3
OBSERVACIÓN:
√9= +3 ó también √9= -3