1.4x²+8x=4х(х+2)
2.3m-6n+mn-2n²=(3m+mn)-(6n+2n²)=m(3+n)-2n(3+n)=(m-2n)(3+n)
3.9a²-16=(3a-4)(3a+4)
4.y³+18y²+81y=у(у+9)²
1.4x²+8x=4х(х+2)
2.3m-6n+mn-2n²=(3m+mn)-(6n+2n²)=m(3+n)-2n(3+n)=(m-2n)(3+n)
3.9a²-16=(3a-4)(3a+4)
4.y³+18y²+81y=у(у+9)²