Check the question again. Is this right?

Log in to add a comment

Check the question again. Is this right?

Log in to add a comment

In your question, a = 4x, b = 5y, c = -4z

Substituting these in above identity,

(4x)³ + (5y)³ + (-4z)³ - 3X(4x)(5y)(-4z) =

(4x+5y-4z)(16x² + 25y² + 16z² - 20xy + 20yz + 16zx)

so, (4x)³ + (5y)³ + (-4z)³ - 3X(4x)(5y)(-4z)

= (4x+5y-4z)(16x² + 25y² + 16z² - 20xy + 20yz + 16zx)