Question

quais sao as raizes reais da equacao:
x²-2x-360:0?

Answer 1

x² - 2x - 360 = 0

Resolver por Bháskara

a = 1
b = - 2 
c = - 360

Δ = b² - 4 . a . c
Δ = ( - 2 )² - 4 . 1 . ( - 360)
Δ = 4 + 1.440
Δ = 1.444

x = - b + - √Δ/2a
x = - ( - 2) + - √1.444 / 2.1
x = 2 + - 38/2

x' = 40/2 ⇒ x' = 20
x" = - 36/2 ⇒ x" = - 18

S = { - 18 e 20 }