Question

Me ajudem com a 3º questão

Answer 1

I can't read that language but I'll guess it says write a second degree equation then solve for n when d=10.

`10 = (n(n-3))/(2)`

`20 = n^2 - 3n`

`n^2 - 3n - 20 = 0`

Answer: n² - 3n - 20 = 0

That doesn't factor so there is no integer n solution.

That means there are no polygons with 10 diagonals.

`n = \frac 1 2(3 \pm √(89))`