Question

Solve:
(a). (5x+4y)³​

Answer 1

Answer:

125x³+64y³+240xy²+300x²y

Step-by-step explanation:

(a+b)³=a³+b³+3ab(a+b)

Answer 2

Answer:

125x³ + 64y³ + 300x²y + 240xy²

Step-by-step explanation:

( a + b )³ = a³ + b³ + 3ab ( a + b )

Here,

a = 5x

b = 4y

( 5x + 4y )³ = ( 5x )³ + ( 4y )³ + 3 ( 5x ) ( 4y )

= 125x³ + 64y³ + 60xy ( 5x + 4y )

= 125x³ + 64y³ + 60xy ( 5x ) + 60xy ( 4y )

( 5x + 4y ) = 125x³ + 64y³ + 300x²y +240xy²