Question

Resolva as equações do 2° grau incompletas:

Answer 1

2.
a) 1/2x² = 0
x' = x" = 0

b) x² + 9x = 0
x(x + 9) = 0

x' = 0
x" + 9 = 0
x" = -9

c) 6x² + 7x = 0
x(6x + 7) = 0

x = 0
6x + 7 = 0
x = -7/6

d) -4x² + 1 = 0
-4x² = -1
x² = -1/-4
x² = √1/4
x' = +1/2
x" = -1/2

e) -x² + 5 = 0
     x² - 5 = 0
     x² = 5
x' = √5
x" = -√5

f) x² +1 = 2
   x² = 2 - 1
  x² = 1

x' = 1
x" = -1