Question

Me ajudem, isso da só 2 raiz de 2?

Answer 1

x² -4x +2 = 0

∆=(-4)²-4.1.2= 16-8=8 => √∆=√4.2= 2√2

x = -b±√∆/2.a

x = 4±2√2/2.1

x' = 4+2√2/2 = 2(2+√2)/2 = (2+√2) ✓

x" = 4-2√2/2 = 2(2-√2)/2 = (2-√2) ✓