Step-by-step explanation:
To write a polynomial in standard form, put the degree that are the greatest first 
So here it would be 
[tex] {x}^{5}   + 4 {x}^{3}  - 3 {x}^{2}  + 10[/tex]
Remember constant are numbers that you learned back in elementary,
Numbers like 10,90,4,1,0,-3 etc.
Remember that constant are basically represented like this 
[tex]k \times  {x}^{0} [/tex]
For example, 10 is represented like
[tex]10 \times  {x}^{0} [/tex]
Since 0 is the smallest degree possible, for a polynomial, constants  are the last term of a polynomial in standard form