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# Derivatives of Polynomial Functions

• Last Updated : 15 Dec, 2020

Derivatives are used in Calculus to measure the rate of change of a function with respect to a variable. The use of derivatives is very important in Mathematics. It is used to solve many problems in mathematics like to find out maxima or minima of a function, slope of a function, to tell whether a function is increasing or decreasing. If a function is written as y = f(x) and we want to find the derivative of this function then it will be written as dy/dx and can be pronounced as the rate of change of y with respect to x.

## The derivative of a polynomial function

To calculate the derivative of a polynomial function, first, you should know the product rule of derivatives and the basic rule of the derivative.

### Product rule of derivative (Here n can be either positive or negative value)

Understand in this way: The old power of the variable is multiplied with the coefficient of the variable and the new power of the variable is decreased by 1 from the old power.

Example: Find the derivative of x3?

Solution:

Let y = x3 ### Some basic rules of derivative

• If y = c f(x) • If y = c •  Example 1: Find the derivative of 4x3 + 7x?

Solution:

Let y = 4x3 + 7x Example 2: Find the derivative of 3x2 – 7?

Solution:

Let y = 3x2 – 7 ## Some more examples on derivative of polynomials

Example 1: Find the derivative of ?

Solution: This can be written as

y = x−7 Example 2: Find the derivative of 7x5 + x3 − x?

Solution:

Let y = 7x5 + x3 − x Example 3: Find the derivative of (x + 5)2 + 6x3 − 4?

Solution:

Let y = (x + 5)2 + 6x3 − 4 Example 4: Find the derivative of 6x3 + (6x + 5)2 − 8x?

Solution:

Let y = 6x3 + (6x + 5)2 − 8x Example 5: Find the derivative of ?

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