Răspunsuri

2014-04-12T09:40:18+03:00
3x-15-(5-5x)(1+x)=(x-3)x²+2x²-4x+1+13
==>
3x-15-(5+5x-5x-5x²)=x³-3x²+2x²-4x+14
3x-15-5+5x²=x³-x²-4x+14
3x-20+5x²=x³-x²-4x+14
7x+6x²-x³-34=0