Explicação passo-a-passo:
x² - 7x + 10 = 0
a= 1; b = -7; c = 10
D = -7² - 4 . 1 . 10
D = 49 - 40
D = 9
x' = -(-7) + 3
2 . 1
x' = 7 + 3
2
x' = 10
2
x' = 5
x" = -(-7) - 3
2 . 1
x" = 7 - 3
2
x'' = 4
2
x'' = 2
x² - 5x = 0
x . (x - 5) = 0
x = 0
x - 5 = 0
x = 5
x² - 5x + 6 = 0
a= 1; b = -5; c = 6
D = -5² - 4 . 1 . 6
D = 25 - 24
D = 1
x' = -(-5) + 1
2 . 1
x' = 5 + 1
2
x' = 6
2
x' = 3
x" = -(-5) - 1
2 . 1
x" = 5 - 1
2
x'' = 4
2
x'' = 2
