Answer:
[tex]x3 - 2x^{2} + 4x - - 8 = 5x {}^{3} - 10x {}^{2} [/tex]
add the whole number with its algebraic expression.
[tex]x {}^{3} + 4x = 5x^{3} \\ 2x {}^{2} + - 8 = - 6x {}^{2}[/tex]
if there is no possible number on the variable, it is considered as one "1".
so the answer will be:
[tex]5x {}^{3} - - 6x {}^{2} [/tex]
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