Question

resolva as seguintes equações do 2 grau
a)4x^2-9×=0
b)4x^2-12x=0
c)5x^2+x=0
d)x^2+x=0
e)7x^2-x=0
f)2x^2=7x
g)2x^2=8x
h)7x^2=-14x
i)-2x^2+10×=0

Answer 1

Utilizando a Formula de Baskara: 
Δ = b² - 4.a.c

-b ± √Δ / 2 . a 

a) x1 = 3/2, x2 = -3/2
b) x1 = 0, x2 = 3
c) x1 = -1/5, x2 = 0
d) x1 = -1, x2 = 0
e) x1 = 0, x2 = 1/7
f) x1 = 0, x2 = 7/2
g) x1 = 0, x2 = 4
h) x1 = -2, x2 = 0
i) x1 = 0, x2 = 5