factorise please solve
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HEYA!!
8x³ - 36x² + 22x + 21
8x³ - 40x² + 4x² + 42x - 20x + 21
8x³ - 40x² + 42x + 4x² - 20x + 21
2x ( 4x² - 20x + 21 ) +1( 4x² - 20x + 21 )
( 2x + 1 ) ( 4x² - 20x + 21 )
( 2x + 1 ) ( 4x² -6x - 14x + 21 )
( 2x + 1 ) { 2x ( 2x - 3 ) -7 ( 2x - 3 ) }
( 2x +1 ) ( 2x -7 ) ( 2x - 3 )
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