Question

Qual a resposta de ×2-7×+10=0

Answer 1

Δ = b² - 4ac
Δ = (-7)² -4*1*10
Δ = 49 - 40
Δ = 9

X' = -b + √Δ     = -(-7) + √9     = 7+3       = 10/2 = 5
       ----------         -----------         ------
           2*a                2*1               2

X'' = -b - √Δ     = -(-7) - √9     = 7-3       = 4/2 = 2
       ----------         -----------         ------
           2*a                2*1               2