Find a 4th Degree Polynomial with Specific Conditions

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In summary, the problem is to find a polynomial of degree 4 that increases in the intervals (-∞,1) and (2,3), decreases in the interval (1,2) and (3,∞), and satisifes the condition f(0)=1. The solution is to use the three equations to solve for three of the variables in terms of the other one, and then arbitrarily choose a value for that one to get one polynomial out of the infinite number that satisfy the given conditions.
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utkarshakash
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Homework Statement


Find a polynomial f(x) of degree 4 which increases in the intervals (-∞,1) and (2,3) and decreases in the interval (1,2) and (3,∞) and satisifes the condition f(0)=1

Homework Equations



The Attempt at a Solution


Let f(x)=ax^4+bx^3+cx^2+dx+1
f'(1)=f'(2)=f'(3)=0

But using the above results I get only 3 eqns whereas there are 4 variables.
 
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  • #2
You have to find one polynomial from the infinite many which obey the conditions.

ehild
 
  • #3
ehild said:
You have to find one polynomial from the infinite many which obey the conditions.

ehild

I still can't figure out.
 
  • #4
There are a lot of polynomials which satisfy the requirements. Luckily you only need ONE of them, get it?
 
  • #5
What you are being told is that this problem does NOT have a single, unique, answer. You can use the three equations to solve for three of a, b, c, and d, in terms of the other one. Then just arbitrarily choose a value for that one to get one such polynomial out of the infinite number that satisfy these conditions.
 
  • #6
ehild said:
You have to find one polynomial from the infinite many which obey the conditions.

ehild

utkarshakash said:
I still can't figure out.

That doesn't help us to help you. Nor does it show any effort.

HallsofIvy said:
What you are being told is that this problem does NOT have a single, unique, answer. You can use the three equations to solve for three of a, b, c, and d, in terms of the other one. Then just arbitrarily choose a value for that one to get one such polynomial out of the infinite number that satisfy these conditions.

Halls just told you how to work the problem. Have you tried that?
 

What is a 4th degree polynomial?

A 4th degree polynomial is a mathematical expression that contains terms with a maximum degree of 4. It is also known as a quartic polynomial.

How do you find a 4th degree polynomial with specific conditions?

To find a 4th degree polynomial with specific conditions, you need to set up a system of equations based on the given conditions. Then, you can use algebraic methods, such as substitution or elimination, to solve for the coefficients of the polynomial.

What are some common conditions given for finding a 4th degree polynomial?

Some common conditions given for finding a 4th degree polynomial include the polynomial's degree, its roots or zeros, and its coefficients. Other conditions may include the polynomial's maximum or minimum values, inflection points, or its behavior at certain points.

Are there any specific methods for finding a 4th degree polynomial?

Yes, there are specific methods such as the Rational Root Theorem, Descartes' Rule of Signs, and Synthetic Division that can be used to find a 4th degree polynomial with specific conditions. These methods can help narrow down the possible solutions and make the process more efficient.

What is the significance of finding a 4th degree polynomial with specific conditions?

Finding a 4th degree polynomial with specific conditions is important in many areas of mathematics and science. It can be used to model real-world phenomena, make predictions, and solve problems in various fields such as physics, engineering, and economics.

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