Math

(3z^4 -2z^3- 9) - (4z^3 - 6z^2 + 8)

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(3z^4 -2z^3- 9) - (4z^3 - 6z^2 + 8)

3z^4 -2z^3-9 - 4z^3 + 6z^2 - 8

3z^4 -2z^3- 4z^3 + 6z^2 -9 - 8

3z^4 -6z^3 + 6z^2 -17