Resposta:
10x²-5x=2x²+4x
10x²-2x²-5x-4x=0
8x²-9x=0
[tex](-b±\sqrt{b²-4.a.c})/2.a[/tex]
[tex](-(-9)±\sqrt{(-9)²-4.8.0})/2.8[/tex]
[tex](9±\sqrt{81})/16[/tex]
[tex](9±9)/16[/tex]
x1=(9+9)/16=18/16=9/8
x2=(9-9)/16=0
