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Descompuneti in factori . a,b, c,d

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Cristinatibulca
a. 7x³-14x²+28x=7x(x²-14x+4)=7x(x-2)²
b.  4x(y+2)-(y+2)y=(y+2)(4x-y)
c. x⁴-x²-2x-1=x⁴-(x²+2x+1)=(x²)²-(x+1)²=(x²-x-x)(x²+x+1)
d, 2x²+3x+1=2x²+2x+x+1=2x(x+1)+(x+1)=(x+1)(2x+1)

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