# Thread: Find a possible equation for this third-degree polynomial if...

1. ## Find a possible equation for this third-degree polynomial if...

a = -3, b = -5, c = 1, and d = 5.

Thank you =)

2. Originally Posted by melliep
a = -3, b = -5, c = 1, and d = 5.

Thank you =)
I asume you have a cubic model somewhere in your class notes in which a, b, c and d are defined .... Where exactly are you stuck?

3. I'm just confused on what I'm supposed to do...well obviously.

I put -3x^3-5x^2+x+5 but that was incorrect.

4. Originally Posted by melliep
I'm just confused on what I'm supposed to do...well obviously.

I put -3x^3-5x^2+x+5 but that was incorrect.
Your answer looks reasonable to me (but having said that, you've given no context as to what a, b, c and d mean). I suggest you ask your instructor to explain why it's wrong.

5. What, exactly, is the original question? You said "Find a possible equation for this third-degree polynomial if...
a = -3, b = -5, c = 1, and d = 5." But that gives no idea at all what "a", "b", "c", and "d" are.

mr fantastic guessed that you were using the form $\displaystyle ax^3+ bx^2+ cx+ d$ so you just put the given numbers in for the letters. If that is not correct then what does your text book or where ever you got this problem say a, b, c, and d are?