Question

Resolva a equação Cx,2 = 10

Answer 1

Cx,2 = 10

x.(x-1)/2! = 10

x²-x/2 = 10

x² -x -20= 0

∆ = 1² -4.1.(-20)= 1 +80=81 => √∆=9

x' = -b+√∆/2a = 1+9/2 = 10/2 = 5 ✓