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

• Sep 8th 2010, 07:19 PM
melliep
Find a possible equation for this third-degree polynomial if...
a = -3, b = -5, c = 1, and d = 5.

Thank you =)
• Sep 8th 2010, 07:46 PM
mr fantastic
Quote:

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?
• Sep 8th 2010, 07:53 PM
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.
• Sep 8th 2010, 07:58 PM
mr fantastic
Quote:

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.
• Sep 11th 2010, 04:51 AM
HallsofIvy
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 $ax^3+ bx^2+ cx+ d$ 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?