Question

1- Determine as raizes das equações:

 

a) $<var>9x^{2}</var>$ + 6x = 0 

b)  $<var>x^{2}</var>$ - 25 = 0

 

Answer 1

a) $<var>\Delta</var>$ = 6² - 4 . 9 . 0

   ''   = 36

 x1 = -6 - 6 / 2.9

x1 = -12 / 18

x1 = - 2 / 3

 

x2 = -6 + 6 / 2.9

x2 =  0 / 18

x2 = 0

 

b) x²-25 = 0    -----> x² = 25 -------> x = $<var>\sqrt {25}</var>$ -------> x = +- 5