Question

Me ajudem por favor

1)Calcule as raizes das equacoes de 2 grau
a) 5x²- 20 = 0

d) 7x²+ 5x = 0
e) 2x²+ 5x = 0
f) - x² + 4x = 0


2) quais das equacoes a seguir nao possuem raizes reais

a) - x² - 5 = 0
b) x² + 13 = 0
d) - x² + 2 =o
e) x² + 7 = 4

3) calcule as raizes de cada equacao

a) (2x + 3) ² - 9 = 12x
b) (3x - 1)² = 1
c) ( x - 2) . (x + 4) = 2 . (x + 4)

Answer 1

1 a) 5x²-20=0.
5x²=20.
x²=20/5
x=√4
x=2