Question

encontre as raizes (x1 e x2) da equacao . x*-x-20=0

Answer 1

x* - x - 20 = 0       a = 1 |  b = -1  | c = -20

b² - 4*a*c
1 - 4*(-20)
delta = 81 
(raiz de 81 = 9)

(-b+/-raizdedelta)/2a
(1 + 9)/2 = 5 (1a raiz)

(1 - 9)/2 = -8/2 = -4 (2a raiz)