Respostas

2014-01-11T14:28:48-02:00
x²+3x-10=0
a= 1 b=3 c=-10

Δ= b²-4ac
Δ= (3)²-4·1·(-10)
Δ=9- (-40)
Δ= 9+40
Δ= 49

x=  -b +/- √Δ/2a
x= -3 +/-√49/2·1
x= -3+/-7/2

x'= 2
x''= -5

S:[-5,2]