# Finding Linear, Quadratic and Cubic polynomials

## Linear, Quadratic, and Cubic polynomials from Table

A polynomial in X is an algebraic expression of the form f(x) = a0
+ a1x + a2x2 + a3 x3 +……….+ an xn, where a1, a2, a3….an are real
numbers and all the indexes of ‘x’ are non-negative integers. Polynomial is
derived from the words “poly” and “nomial,” which together
mean “many terms.” Constants, variables, and exponents can all be
found in a polynomial.

The highest degree of a polynomial’s exponent(variable) with a
non-zero coefficient is its degree. The term “degree” means
“power” in this context. Let’s look at different degrees of

### Degree of a Polynomial

The degree of a polynomial is the highest degree exponent term.

All you have to do to find the degree is find the largest exponent
in the given polynomial.

For instance, consider the following equation:

x3 + 2×2 + 4x + 3 = f(x). The equation has a degree of three. The
degree of the polynomial is defined as the highest power of the variable in the
polynomial.

A polynomial of degree 2 is f(x) = 7×2 – 3x + 12.

f(x) = an xn + an-1 xn-1 + an-2xn-2 +……………….+ a1 x +
a0 where a0, a1, a2……an are constants and a 0

We have the following names for the degree of polynomial based on
the degree of polynomial.

### Constant Polynomial

A constant polynomial is a polynomial with the highest degree

zero. There are no variables in it, only constants.

For example, constant polynomials are f(x) = 6, g(x) = -22, h(y) =
5/2,

and so on. F(x) = c is a constant polynomial in general.

The zero
polynomial is the constant polynomial 0 or f(x) = 0.

## Equation Formatter

### Linear Polynomials

A linear polynomial is a polynomial with the highest degree

number.

Linear polynomials include f(x) = x-12, g(x) = 12 x, and h(x) =
-7x + 8.g(x) = axe + b is a linear polynomial in general.

A polynomial having its highest degree 2 is known as a quadratic

polynomial.

For example, f (x) = 2x2 – 3x + 15, g(y) = 3/2 y2 – 4y + 11 are quadratic polynomials.

In general g(x) = ax2+ bx + c, a ≠ 0 is a quadratic polynomial.

### Cubic Polynomial

A polynomial having its highest degree 3 is known as a Cubic

polynomial.

For example, f (x) = 8x3 + 2x2– 3x + 15, g(y) =  y3 – 4y + 11 are cubic polynomials.

In general g(x) = ax3 + bx2 + cx + d, a ≠ 0 is a quadratic polynomial.

cubic functions are represented in the following three different tables. These
tables will be used to locate functions.

Using finite-difference tables,
find the rule for each of the following sequences:

A 20, 19, 18, 17,16, ………  B 5, 11, 19, 29, 41, ………. C 6, 26, 64, 126,
218, 346, ………

#### A- Solution

 X F(X) 1st Difference 1 20 -1 2 19 -1 3 18 -1 4 17 -1 5 16

The function is
a Linear of the form f(X) = ax + b. From the difference table for the quadratic

a = -1 and
therefore a = -1 (using column 1st Diff 2)

Finally, a + b
= 20 = -1 + b = 20 and therefore b = 21 (using column F(X))

f (X) = -1X + 21

#### B- Solution

X      f(X)    ∆1    ∆2

The function is a quadratic of the form f (X) = aX2 + bx + c. From
the difference table for the quadratic 2a = 2 and therefore a = 1 (using column
2)

Also, 3a + b = 6 and therefore b = 3 (using column ∆1)

Finally, a + b + c = 5 and therefore c = 1 (using column f (X))

Therefore, F(X) = X2 + 3X + 1

#### C- Solution

X        f(X)
1        ∆2         ∆
3

Therefore f(n) = ax3 + bx2 + cx + d

6a = 6                          a = 1 (from
column ∆1)

12a + 2b = 18              b = 3 (from
column ∆2)

7a + 3b + c = 20         c = 4 (from column ∆3)

a + b + c + d = 6         d = 2 (from column
f (x))

f (x) = x^3
+ 3x^2 + 4x − 2

Tables