Răspunsuri

2014-04-11T22:52:33+03:00
X²+2x-6x²-8x-9x-12=18-5x²
-5x²-15x-12=18-5x²  -5x²  cu -5x²  se reduc
-15x-12=18
-15x=18+12
-15x=30
x=-2