-2x^2=-4x.
(-5x^2+4x^3)=(-25x+64x).
-4x(-25x+64x)=100x-256x.
100x-256x=-156x
-156x is your final answer.
- 8 + 10
distribute the parenthesis by - 2x²
= 10 - 8
= - 8 + 10 ← in standard form
Note that a polynomial expressed in standard form
The first term is the term with the highest exponent followed by the other terms in descending order of exponents
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