Answer:

x⁴ + 8x²y² + 16y⁴ - 9z⁴

{(x²)² + 2*x²*4y² + (4y²)²} - (3z²)²

(x² + 4y²)² - (3z²)²

it is in the form of (a² - b²)

we know,

(a² - b²) = (a + b) (a -b)

now,

(x² + 4y² + 3z²) (x² + 4y² - 3z²)

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