Question

( 2 a + 1)³

(2 x+y)³

(a²-4 y)²

Answer 1

(2x + 1) x (2x + 1) x (2x + 1) =  é mesma coisa de (2x + 1) (2x + 1)²
(2x + 1 ) x (4x² + 2x + 2x + 1) =
8x³ + 4x² + 4x² + 2x + 4x² + 2x + 2x + 1 =
8x³ + 12x² + 6x + 1

(2 x+y)³
(2x + y) (2x + y)² =
(2x + y) (4x² + 2xy + 2xy + y²)
8x³ + 4x²y + 4x²y + 2xy² + 4x²y + 2xy² + 2xy² + y³
8x³ + 12x²y + 6xy² + y³

(a² - 4y)²
(a² - 4y) (a² - 4y)
a^4 - 4a²y - 4a²y + 16y²
a^4 - 8a²y + 16y²