Posted by **Jacob** on Thursday, May 31, 2012 at 6:45pm.

Q1. How do I know what a expression is called for example 6x^3-9x+3?

- Math -
**Damon**, Thursday, May 31, 2012 at 6:50pm
it is a polynomial because it is a sum of terms which are coefficients times x^n where n can be any old whole numbers

Since the highest n in this expression is three it is called a cubic polynomial

- Math -
**Jacob**, Thursday, May 31, 2012 at 6:56pm
Thanks-got it cubic trinomial. Here's another one when I have to change signs of negatives and positives for addition and subtraction. How do I do for example 5w^2-4w-7-8w^2+3w-3?

- Math -
**Damon**, Thursday, May 31, 2012 at 7:03pm
If you just want the name that is a quadratic polynomial because the highest power of w is 2.

your alternating signs make no difference at all. Like 5 w^2 - 8 w^2 = -3w^2

- Math -
**Jacob**, Thursday, May 31, 2012 at 7:10pm
No I do not want the Name I want to know how to figure it out once the numbers are all lined up and it is very confusing when signs need to be switched. Can you please explain that?

- Math -
**Damon**, Thursday, May 31, 2012 at 7:35pm
5 w^2 - 8 w^2 = -3 w^2

-4 w + 3 w = -1 w

-3 = -3

so

-3 w^2 - 1 w - 3

or

- (w^2 + w +3)

- Math -
**Jacob**, Thursday, May 31, 2012 at 7:53pm
Thanks. There was ( ) on the 8 and the rest because your answer is not one of the answers

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