Check the question again. Is this right?

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Check the question again. Is this right?

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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)

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

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