Work Step by Step
We simplify by removing the parentheses and combining the like terms as follows: $$ 0.6(0.5x^2 - 0.9x) + 0.4(x^2 +0.4x) \\ =0.3x^2-0.54x+0.4x^2+0.16x \\=0.7x^2-0.38x .$$
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