Respostas

2014-06-30T01:49:36-03:00
 Bom dia,

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

x= \frac{-b+- \sqrt{1} }{2.a}
x1= \frac{-1+1}{4} = 0
x2= \frac{-1-1}{4} = \frac{-2}{4} = \frac{-1}{2}

s=( \frac{-1}{2} ,0)