Question

resposta ? x²-3x=-2

Answer 1

x² - 3x = -2
x² - 3x + 2 = 0

a = 1; b = -3; c = 2

x = [- b ± √(b² - 4ac)] / 2a
x = [- (-3) ± √([-3]² - 4 . 1 . 2)] / 2 . 1
x = [3 ± √(9 - 8)] / 2 
x = [3 ± √1] / 2
x = [3 ± 1] / 2
x' = [3 + 1] / 2 = 4 / 2 = 2
x'' = [3 - 1] / 2 = 2 / 2 = 1

S = {1, 2}

Espero ter ajudado. Valeu!

Answer 2

$x^{2}-3x+2=0 \\ \\ x' = \frac{-(-3)+ \sqrt{(-3)^{2}-4*1*2} }{2*1} = \\ \\ x' = \frac{3 + \sqrt{1} }{2} = \frac{4}{2} = 2 \\ \\ x" = \frac{-(-3)- \sqrt{(-3)^{2}-4*1*2} }{2*1} = \\ \\ x" = \frac{3- \sqrt{1} }{2} = 1$

raizes: x' = 2 e x" = 1