Question

1° Equacoes do 2° grau
a) x2+3x-10=0


Resolva.

Answer 1

x² + 3x - 10 = 0
a = 1 
b = 3
c = - 10
Δ = b² - 4.a.c
Δ = 3² - 4 .1 . (-10)
Δ = 9 + 40
Δ = 49
x = - b + - √Δ/ 2a
x = - 3 + - √49/ 2.1
x = - 3 + - 7/2
x' = 4/2 ⇒ x' = 2
x" = - 10/2 ⇒ x" = - 5

S = { 2 e - 5 }