Question

equações de 2° grau incompletas:

a) 5x²=0
b) 3x²=0
c) x²+3x=0
d) 5x²+(0x=0)
e) 6x²=0
f) x²+25=0
g) x²-49=0
h) x²-7=0

Answer 1

x² √

a)
5x² = 0
x² = 0 * 5
x² = 0
x = √0
x = 0

b)
3x² = 0
x² = 0 * 3
x² = 0
x = √0
x = 0

c)????

d) x² + 3x = 0

x(x + 3) = 0

x' = 0

x" + 3 = 0
x" = - 3

S = {0, -3)

e)
6x² = 0
x² = 0 * 6
x² = 0
x = ± √0
x = 0

s = {0}

f)
x² + 25 = 0
x² = - 25
x = √-25

x = 5 + i

S= {}


x² - 25 = 0
x² = 25
x = ± √25

x' = 5 x" = -5

S = { - 5, 5}

g)

x² - 49 = 0
x² = 49
x = ± √49

x' = - 7 x" = 7

S = { -7 , 7}

h)
x²- 7 = 0
x² = 7
x =