Answer
$6x^{5}+0x^{4}+x^{3}+0x^{2}-3x+15$
Work Step by Step
$6x^{5}+x^{3}-3x+15$
Insert a missing term of $0x^{4}$:
$6x^{5}+x^{3}-3x+15=6x^{5}+0x^{4}+x^{3}-3x+15=...$
Insert a missing term of $0x^{2}$:
$...=6x^{5}+0x^{4}+x^{3}+0x^{2}-3x+15$
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