polynomials am i doing it right?

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

= -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? -

    You'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? -

    for #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? -

    because 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? -

    ok thank you

  • polynomials am i doing it right? -

    no problem:)

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