25x²+13x-24x²-15-3x+12=x²+10x-3
18x³-8x²+4x=2x(9x²-4x+2)
5(x-3)+ x(x-3)=(x-3)(5+x)
4x(y+2)-(y+2)·y=(y+2)(4x-y)
2x²+3x+1=2x²+2x+x+1=2x(x+1)+(x+1)=(x+1)(2x+1)
x²+8x+12=(x+6)(x+2)
10x³-15x²y=5x²(2x-3y)
4x²+4x+1-x⁴=4x(x+1)+(1-x²)(1+x²)=4x(x+1)+(1-x)(1+x)(1+x²)
=(x+1)(4x+1+x²-x-x³)=
=(x+1)(-x³+x²+3x+1)
