Respuesta :

I think it’s c.
Explanation:
When you multiply a polynomial by a monomial you have to add straight across:
(5x^3+9x^2+6x+1)x
x times x^3 is x^4
x^2 times x is x^3
x times x is x^2
1 times x is x
Therefore, the answer is 5x^4+9x^3+6x^2+x or C

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