Answer:
-11x +24
Step-by-step explanation:
The expression is simplified by using the distributive property to eliminate parentheses, then combining like terms.
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Like terms have the same variable part, but different coefficients.
[tex]3x(x -2) -5x(1 -x) -8(x^2-3)\\\\=3x^2-6x-5x+5x^2-8x^2+24\\\\=x^2(3+5-8)+x(-6-5)+24\\\\=\boxed{-11x+24}[/tex]