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2014-01-10T19:03:00+01:00
A=-(3x+1)+(x+1)(x-3)
A=-(3x+1)+(x ² -3x + x -3)
A=-3x-1+x ²-3x + x -3
A=x ² -5x -4
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2014-01-10T19:04:19+01:00
 A= -(3x + 1)+(x+1) ( x-3
 A= -(3x + 1)+ x² -3x + x - 3
 A= -3x -1 +x² -3x +x -3
 A= x² - 6x - 4