Question

Qual a resolução para:
x^2-4x-1=0

Answer 1

x^2-4x-1=0

∆=(-4)² -4.1.(-1)=16 +4=20 => √∆=2√5

x = -b±√∆/2a

x = 4±2√5/2

x' = 4+2√5/2 = 2(2+√5)/2 = 2+√5 ✓

x" = 4-2√5/2 = 2(2-√5)/2 = 2-√5 ✓