Help with polynomial function

Introduction polynomials and polynomial function:
Hear is and brief introduction on Polynomials and Polynomial Functions.An Algebraic expression of the form axn is called a monomial in x, where a is a known number, x is a variable and n is a non-negative integer. The coefficient of yn and n has a number, the degree of the monomial. For example, 7x3 is a monomial in x of degree 3 and 7 is the coefficient of x3. The total value of 2 monomial is known as a binomial and the sum of three monomial is called a trinomial.
Following is the sample exercise on polynomial and polynomials function.

The polynomials with its functions are used to solve the following examples:This also helps us on permutation and combination.

In each of the problem 1 to 3, find the subtraction and write it in the standard form :

1. (x3 + 5x2 – 10x + 6) – (2x3 – 3x – 4)

2. (x4 – 3x2 + 7x – 8) – (2x4 + x2 + 3x)

3. (3x5 – 5x2 + 4x – 7) – (1– 2x + 3x2 – x3) This could also help us on statistical graphs

This is how we learn on polynomial functions. May be in the following lesson i will try to help you more on find the height of a triangle