$$F(x)=-.23 { x }^{ 3 } +0.3 { x }^{ 2 } 0.4x+11.6$$
$-\frac{11x^{3}}{100}+11.6$
$$-0.23x^{3}+0.3x^{3}\times 0.4+11.6$$
$$-0.23x^{3}+0.12x^{3}+11.6$$
$$-0.11x^{3}+11.6$$
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$-\frac{11x^{3}-1160}{100}$
