Question

25 x ao quadrado menos 20 x + 4 = ??

Answer 1

Olá!!


25x² - 20x + 4 = 0


a = 25
b = -20
c = 4


∆ = (-20)² - 4.25.4
∆ = 400 - 400
∆ = 0


X = -(-20) ± √0/2.25

X = 20 ± 0/50

X = 20/50 → 2/5



S={ 2/5 }