Wednesday

April 1, 2015

April 1, 2015

Posted by **anonymous** on Saturday, May 25, 2013 at 10:07am.

= -x^4+3x^3+6

2) (3n^3+n^2-n-4)+(5n^3-4n^2+11)

= 8n^3-3n^2-n+11

- polynomials am i doing it right? -
**MathMate**, Saturday, May 25, 2013 at 10:25amYou're on the right track...

1. expand it and write it out when it is a subtraction:

(x^4+7x^3+7)-(2x^4-4x^3+1)

= x^4+7x^3+7) -2x^4+4x^3-1

= -x^4 +*11*x^3 + 6

2. space out your terms to avoid losing some of them.

(3n^3 + n^2 -n -4)+(5n^3 -4n^2 + 11)

= 3n^3 + n^2 -n -4 + 5n^3 -4n^2 + 11

= 8n^3 - 3n^2 -n + 7

- polynomials am i doing it right? -
**anonymous**, Saturday, May 25, 2013 at 10:41amfor #1 i did

(x^4+7x^3+7)-(2x^4-4x^3+1)

= x^4+7x^3+7-2x^4-4x^3-1

= -x^4+3x^3+6

so why is it wrong?

- polynomials am i doing it right? -
**Mercy**, Saturday, May 25, 2013 at 10:45ambecause you see that when you expanded the polynomials after the -2x^4 yu have a - instead of a positive because recall that when the brackets expand - and - = +.

That is the only thing you did wrong.

Good luck! you are on the right track though.

- polynomials am i doing it right? -
**anonymous**, Saturday, May 25, 2013 at 10:48amok thank you

- polynomials am i doing it right? -
**Mercy**, Saturday, May 25, 2013 at 10:52amno problem:)

**Answer this Question**

**Related Questions**

Polynomials - History of Polynomials. I need to know how polynomials was created...

algebra II - multiplication of polynomials by polynomials. 2^n-3 b^2n-2 (b^2-2^5...

math,correction&help - Is this right:if it still needs more can someone help me ...

Math - Let V={f(x)=c0 + c1x + c2x2 : 01 f(x)dx=1}. In other words, V is the ...

college-Linear Algebra - Let V={f(x)=c0 + c1x + c2x2 : 01 f(x)dx=1}. In other ...

math,help,bobpursly - What are some challenges for rational expressions? Also on...

math - True or False? 1. The product of 2 linear polynomials is quadratic 2. ...

polynomials am i doing it right? - *(8t^2-10t+2)+ (8t+13) = 8t^2-2t+15 *(x^2+5x-...

algebra - Consider the following four polynomials, labeled A - D: A. ( 2x2 - 4x...

Calculus II - Fed loves polynomials with rational coefficients and only such ...