Chapter 8 - Polynomials and Factoring - 8-2 Multiplying and Factoring - Practice and Problem-Solving Exercises - Page 484: 43

a) 6 sides, 3 diagonals b) $n-3$ c) $n^2/2 -3n/2$ d) 20 diagonals

a) The image in the book was referenced. b) A square has four sides and has one diagonal from one vertex. The six sided polygon has three diagonals from one vertex. c) $n/2*(n-3)$ $n^2/2 -3n/2$ d) $n^2/2 -3n/2$ $8^2/2-3*8/2$ $64/2 -24/2$ $32-12$ $20$