0;3x^3(1+3x)-0.8 simplifies to 3x^3 + 9x^4 - 0.8
0.9x^4 + x(0.3x^2-2) simplifies to 0.9x^4 + 0.3x^3 - 2x
0;3x^3(1+3x)-0.8 simplifies to 3x^3 + 9x^4 - 0.8
0.9x^4 + x(0.3x^2-2) simplifies to 0.9x^4 + 0.3x^3 - 2x