(4x + 3)³
= (4x + 3)² × (4x + 3)
= [(4x)² + (4x . 3 . 2) + 3²)] × (4x + 3)
= (16x² + 24x + 9) (4x + 3)
= (16x² . 4x + 24x . 4x + 9 . 4x + 16x² . 3 + 24x . 3 + 9 . 3)
= 64x³ + 96x² + 36x + 48x² + 72x + 27
= 64x³ + 144x² + 108x + 27
....
[tex] \tiny\mathbb\pink{I \: HOPE \: THIS \: HELPS}[/tex]