Answer
3x$^7$-12x$^5$+15x$^3$
Work Step by Step
3x$^3$(x$^4$-4x$^2$+5)
3x$^3$(x$^4$)+3x$^3$(-4x$^2$)+3x$^3$(5)
3x$^7$-12x$^5$+15x$^3$
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