Question

Como resolver x²-2x-35•0

Answer 1

x²-2x-35=0

Δ=(-2)² + 4.35
Δ = 4 + 140
Δ = 144

x = 2 +-√144/2
x = 2 +-12/2

x' = 2+12/2
x' = 14/2
x' = 7

x'' = 2-12/2
x'' = -10/2
x'' = -5                                  S = { -5 , 7 }                 ok

Answer 2

Delta = 2^2-4.1. (-35)
Delta =4+ 140
Delta= 144

X= - ( - 2) +/- raiz de 144
----------------------------
2.1


X= 2 + 12 = 14 = 7
-------------- -----
2 2


X= 2 - 12 = -10 = -5
------------- ------
2 2

{ 7, - 5 }