Serita604 Serita604

15-07-2014
Mathematics

contestada

A polygon has 35 diagonals. How many sides does it have?

Respuesta :

konrad509 konrad509

15-07-2014

[tex]d=35\\ d=\frac{n(n-3)}{2}\\ d=\frac{n(n-3)}{2}\\35=\frac{n(n-3)}{2}\\ 70=n^2-3n\\ n^2-3n-70=0\\ n^2-10n+7n-70=0\\ n(n-10)+7(n-10)=0\\ (n+7)(n-10)=0\\ n=-7 \vee n=10\\\\ n=10 [/tex]

Answer Link

Otras preguntas

Is -√15 an imaginary or irrational number?

Instead of using the values {1,2,3,4,5,6} on dice, suppose a pair of dice have the following: {1,2,2,3,3,4} on one die and {1,3,4,5,6,8} on the other. Find the

Pls HURRY Make predictions about the subject and likely point of view of the following magazine articles. “The Dirty War in Argentina in the 1980s”

CAN SOMEONE PLEASE I BEG OF YOU HELP ME :( IM GIVING ALL MY LAST POINTS JUST TO GET THIS correct

plot the inequality on the number line

helppppp giving brainly too

Please help I will give you Brainlyest

Help!!!! Give a simple overview of the process of photosynthesis.

Solve : 3X + 3x + 1 + 3x + 2 = 39

What is the plural of toad