Respostas

2014-01-12T11:36:14-02:00
(2x+5)(2x-5)
4x²-10+10x-5²
4x²-5²
4x²-25
2014-01-12T11:45:44-02:00
(2X+5)(2X-5)
4X²-10X+10X-25=0
4X²-25=0
X=+-√25/4
X1= +5/2
X2= -5/2