Resposta :
(2x-1)²-(x+2)=2x
4x ² - 4x + 1 - x + 2 = 2x
4x² - 7x + 3 = 0
D= 49 - 48 = 1
x = [tex] \frac{7 +- 1}{8} [/tex]
x' = 1
x'' = 3 / 4
(x-5) . (x-3)-x=5
x² - 3x - 5x + 15 -x = 5
x² - 9x + 10 =0
D= 81 - 40 = 41
x= [tex] \frac{9 +- \sqrt{41} }{2} [/tex]
4x ² - 4x + 1 - x + 2 = 2x
4x² - 7x + 3 = 0
D= 49 - 48 = 1
x = [tex] \frac{7 +- 1}{8} [/tex]
x' = 1
x'' = 3 / 4
(x-5) . (x-3)-x=5
x² - 3x - 5x + 15 -x = 5
x² - 9x + 10 =0
D= 81 - 40 = 41
x= [tex] \frac{9 +- \sqrt{41} }{2} [/tex]