Question

calcule as raizes da equaçao

Answer 1

a)5 x² - 20 = 0
5 x² = 20
x² = 20/5
x² = 4
x =\/¨4
x´= +2 x" = -2
S = [-2 ,+ 2}

b)\/¨3/2 . x² = 0
x² = 0 /\/¨3/2
x² = 0 . 2/\/¨3
x² = 0/\/¨3
x² = 0
x = \/¨0
x = 0

c)x²  +  x/ 5 = 0
x² /1 = -x/5 multiplicando em cruz
5 x² = -x
5 x² + x = 0
x(5 x + 1 ) = 0
x = 0
5 x + 1 = 0
5 x = -1
x = -1/5