Răspunsuri

2014-04-28T16:34:53+03:00
3+2x²-(x-2)² = -3x-7
3+2x²-x²+4x-4 = -3x-7
3+x²+4x-4 = -3x-7

x=-1
3+1-4-4 = 3-7
-4=-4 adevarat => x=-1
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