Question

-x²-2x+3=0
Qual a Resposta ?

Answer 1

-x²-2x+3=0.(-1)
+x² +2x -3 =0
a=1 ,b=+2 , c= -3
▲=b² -4.a.c= (2)² -4 (1).(-3)=4+12=16

x= (-b +ou-√▲)/2.a
x= (-(+2) +ou- √16)/2.1
x= (-2 +ou- 4)/2
x'= (-2+4)/2= +2/2=1
x"=(-2-4)/2= -6/2= -3

S= 1 e -3