Question

Expand the following
(2x + 5y)³​

Answer 1

Answer:

$c \binom{3}{0} (2x) {}^{3} + c \binom{3}{1} (2x) {}^{2} 5y + c \binom{3}{2} 2x(5y) {}^{2} + c \binom{3}{3} (5y) {}^{3} =$

$8x {}^{3} + 3 \times 4 {x}^{2} \times 5y + 3 \times 2x \times 25 {y}^{2} + 125 {y}^{3} =$

$8 {x}^{3} + 60 {x}^{2} y + 150x {y}^{2} + 125 {y}^{3}$

Ans.