(5x^4-9x^2-11)-(2x^3+3x^2-12)
= 5x^4-9x^2-11-2x^3-3x^2+12)
= 5x^4 - 2x^3 - 9x^2 - 3x^2 - 11 + 12
= 5x^4 - 2x^3 - 12x^2 + 1
subtract (5x^4-9x^2-11)-(2x^3+3x^2-12)
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