[tex]\begin{gathered} (2.7x^3-5.5x^2-2)-(5.5x^3-7.9x^2+\text{ 2) }\ldots..\text{remove parenthesis } \\ =\text{ 2.7}x^{3\text{ }}-5.5x^2-2-5.5x^3+7.9x^2\text{ -2} \\ =\text{ (2}.7x^{3\text{ }}-5.5x^3)-5.5x^2+7.9x^2-2-2^{} \\ =\text{ }-2.8x^3+2.4x^2-4^{} \end{gathered}[/tex]
