Răspuns :
4x²+12x+9+x²+2x-(6x²+8x+9x+12)=4(x²-4x+4)-5x²+10x+11
5x²+14x+9-6x²-17x-12=4x²-16x+16-5x²+10x+11
-x²-3x-3=-x²-6x+27
-x²+x²-3x+6x=27+3
3x=30
x=30/3
x=10
5x²+14x+9-6x²-17x-12=4x²-16x+16-5x²+10x+11
-x²-3x-3=-x²-6x+27
-x²+x²-3x+6x=27+3
3x=30
x=30/3
x=10
4x² + 12x + 9 + x² + 2x - ( 6x² + 8x + 9x + 12 ) = 4 ( x² - 4x + 4 ) - 5x² + 10x + 11
4x² + 12x + 9 + x² + 2x - 6x² - 8x - 9x - 12 = 4x² - 16x + 16 - 5x² + 10x + 11
-x² - 3x - 3 = -x² - 6x + 27
-3x + 6x = 27 + 3
3x = 30
x = 30 : 3
x = 10
4x² + 12x + 9 + x² + 2x - 6x² - 8x - 9x - 12 = 4x² - 16x + 16 - 5x² + 10x + 11
-x² - 3x - 3 = -x² - 6x + 27
-3x + 6x = 27 + 3
3x = 30
x = 30 : 3
x = 10