Question

Encontre a raiz da equação dada: 25x² - 20x + 4 = 0:
a) S= ( 2/5)?
b) S= ( -5/2)?
c) S= (-2/5)?
ou
d) S= ( 5/2)?

Answer 1

(-b±√(b²-4ac))/2a
(-(-20)±√((-20)²-4*25*4))/2*25
(20±√(400-400))/50
(20±0)/50
20/50
2/5
(a)