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b) w(x)= x³+3x²-4x-12 = x²(x+3) -4(x+3) = (x²-4)(x+3)=(x-2)(x+2)(x+3)
c) w(x)= 1+6x+12x²+8x³ = 1³ +3*2x+3*2*(2x)²+(2x)³=(1+2x)³