Question

$(3x - 4 {y}^{ 3} ) - (3x - 4 y {)}^{3}$answer please important​

Answer 1

Answer:

We know that

(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