( x + 7 ) ( 2x pangkat dua – 9x + 6 ) = Tolong jawab ya pakai caranya

(x + 7)(2x² – 9x + 6)
= 2x³ + 14x² – 9x² – 63x + 6x + 42
= 2x³ + 5x² – 57x + 42