Question

me ajudem
x²-4x-5=0​

Answer 1

∆=(-4)² -4.1.(-5)=16 +20=36 => √∆=6

x= -b±√∆/2a

x= 4±6/2

x'= 4+6/2 =10/2 = 5 ✓

x"= 4-6/2 =-2/2 = -1 ✓