Question

T² + T + 20 = 0 Valor do T.

Answer 1

delta de t² - t - 20 = 0 

delta = t² -4at = 1 - 4.1 .-20 = 1 + 80 = 81 

x' = (-t + V81)/2t 
x' = ( 1 + 9 )/2 = 10/2 = 5 

x" = (-t + V81)/2t 
x" = (1 - 9 ) / 2 
x" = -8 / 2 = - 4 

S = { 5 , -4 }