Question

Expand (3x - 4y)^3
expand​

Answer 1

Answer:

27x³-64y³-108x²y+36xy²

Step-by-step explanation:

its simple use the identity

(x-y)³ = x³-y³-3x²y+3xy²

pls mark my answer as brainliest

Answer 2

(a - b)3 = a3 - b3 - 3ab(a - b)

Now, (3x - 4y)3 = (3x)3 - (4y)3 - 3*3x*4y(3x - 4y)

=> (3x - 4y)3 = 27x3 - 64y3 - 36xy(3x - 4y)

=> (3x - 4y)3 = 27x3 - 64y3 - 36xy * 3x + 36xy * 4y

=> (3x - 4y)3 = 27x3 - 64y3 - 108x2 y + 144xy2