Question

[ x+4y ]^3 write the cubes in expanded form ​

Answer 1

Using identity

( a+b)³ = a³+b³ +3ab (a+b)

Here, a = x and b = 4y

:.

(x+4y)³ = x³ + (4y)³ + 3(x)(4y)(x+4y)

= x³ + 64y³ + 12xy(x+4y)

= x³ + 64y³ + 12x²y + 48xy²

Hope you got it !!