Coefficients are 2, 5, -1. (Coefficients are the numbers before the x)
Constant is 3 (constant is the number without any x)
2x^5+0x^4+5x^3+0x^2-x+3
You start with the biggest and end with the smallest, if anything isnt present int he original equation (for example x^4 in this case) put it in with a zero before it.
