Question

Resolva as equações
2X² - 18 =0


X² +5X =0

Answer 1

2x² - 18 = 0
2x² = 18
x² = 18 ÷ 2
x² = 9
x = +-√9
x = +-3
x' = 3
x'' = -3

x² + 5x + = 0
x (x + 5) = 0
x + 5 = 0
x = - 5
x' = 0
x'' = - 5