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Answer:
[tex]\textbf{C.}~2x^4 -9x^3-8x^2 +15x[/tex]
Step-by-step explanation:
[tex]~~~~(x^2 -5x)(2x^2 +x-3)\\\\=2x^4+x^3 -3x^2 -10x^3 -5x^2 +15x\\\\=2x^4 -9x^3-8x^2 +15x[/tex]