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Answer: Choice B)
-5x^3 + 9x^2 + 2x
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Explanation:
Standard form is where the largest exponent term goes first, then the next largest, and so on. The exponents are decreasing when moving from left to right.
So that's why -5x^3+9x^2+2x is in standard form. Think of the 2x at the end as 2x^1. That might help show the exponents are decreasing (3,2,1).
The largest exponent is the degree, meaning that we have a third degree polynomial (aka cubic polynomial).
The first term -5x^3 is considered the leading term and -5 is the leading coefficient.