Posted by Cassidy on Friday, June 5, 2009 at 9:32am.
I'm having a hard time figuring out a quadratic model for this data.
How do I go about doing this?
Is there a website that could help me?
- Algebra II - MathMate, Friday, June 5, 2009 at 10:00am
First show that this is a quadratic relationship by taking differences and second differences:
y dy d2y
3 10 8
13 18 8
31 26 8
57 34 8
91 42 8
If the second difference is constant, it is a quadratic relationship.
Assume the quadratic model as:
f(x)=ax2 + bx + c
Thus, the second difference = 2a
By substituting values of x and a into one of the formulas, b can be found
Substitute a and b in f(1), we get
Answer This Question
More Related Questions
- Quadratic equations Trig - I am having a hard time figuring this out. I know I ...
- Latin - I'm having a hard time figuring out what Au means
- Econometric -SAS - I am having trouble figuring out the correct code. I am ...
- English - Theme - What is the theme of Margaret Atwood's At the Tourist Centre ...
- Math - What value of x makes this equation true? 1/3(9x-2)+1=2(4x+1) a) x=-3 b)x...
- Math (surveying) - I am having a really hard time figuring this problem out. I ...
- Algebra - Im having a hard time figuring out this problem: Use the function, y...
- science - need to make a silent proof box 15,000 cubic centimeters. What is the ...
- Math - I am having a hard time figuring out if I have a piece of ribbon that is ...
- math - I am having a hard time figuring out the distane between two points the ...