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x+4 3x
= x² (x²-16)
3x ( x+4)
= x^4 -16x²
3x² + 12x
h. 3a²b³c × 4ac²
2b²c 6ab
= 4ac²(3a²b³c)
6ab ( 2b²c)
= 12a³b³c³
12ab³c