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\left(2.2x+3.3\right)\left(2x^{2}-1\right)-4x^{3}
Use the distributive property to multiply 1.1 by 2x+3.
4.4x^{3}-2.2x+6.6x^{2}-3.3-4x^{3}
Use the distributive property to multiply 2.2x+3.3 by 2x^{2}-1.
0.4x^{3}-2.2x+6.6x^{2}-3.3
Combine 4.4x^{3} and -4x^{3} to get 0.4x^{3}.
\left(2.2x+3.3\right)\left(2x^{2}-1\right)-4x^{3}
Use the distributive property to multiply 1.1 by 2x+3.
4.4x^{3}-2.2x+6.6x^{2}-3.3-4x^{3}
Use the distributive property to multiply 2.2x+3.3 by 2x^{2}-1.
0.4x^{3}-2.2x+6.6x^{2}-3.3
Combine 4.4x^{3} and -4x^{3} to get 0.4x^{3}.