1)3z²-12=3(z²-4)=3(z+2)(z-2)
2)2x²-50=2(x²-25)=2(x+5)(x-5)
3)5a²+10a+5=5(a²+2a+1)=5.(a+1)(a+1)=5(a+1)²
4)2y²-8y+8=2(y²-4y+4)=2(y-2)(y-2)=2(y-2)²
5)2b³+54=2(b³+27)=2(b³+3³)=2(b+3)(b²-3b+9)
6)x³+2x²+x=x(x²+2x+1)=x(x+1)(x+1)=x(x+1)²
7)ax²-a=a(x²-1)=a(x+1)(x-1)
8)m-m³=m(1-m²)=m(1+m)(1-m)
9)4x²+8x+4=4(x²+2x+1)=4(x+1)(x+1)=4(x+1)²
10)9y-4y³=y(9-4y²)=y(3+2y)(3-2y)
11)ax³-8a=a(x³-8)=a(x³-2³)=a(x-2)(x²+2x+4)