Question

Exercícios
Resolva as equações do 2º grau incompletas com b= 0.
x- 9 = 0
x2 + 4 = 20
2x2 = 72
3x2 - 75 = 0
x2 + 16 = 0
2x2 + 14 = 46
x2 - 2 = 0​

Answer 1

x²- 9 = 0 => x²=9 => x=√9 = ± 3

x2 + 4 = 20 => x²=16 => x=√16 = ± 4

2x2 = 72 => x²=36 => x=√36 = ± 6

3x2 - 75 = 0 => x²=25 => x=√25 = ± 5

x2 + 16 = 0 => x²=-16 => x=√-16 = { }

2x2 + 14 = 46 ÷> 2x²=32 => x²=16 => x=±4

x2 - 2 = 0 => x²=2 => x= ±√2