Question

evaluate (x2-y2)^2 + 4x²y²​

Answer 1

Answer:

Step-by-step explanation:

$(x^2-y^2)^2 + 4x^2y^2\\=x^4-4x^2y^2+y^4+4x^2y^2\\=x^4+y^4$

Answer 2

Answer:

( x² - y² )² + 4x²y²

x⁴ + y⁴ - 2x²y² + 4x²y² [( a - b )² = a² + b² - 2ab]

x⁴ + y⁴ + 2x²y²

( x² + y² )² [a² + b² + 2ab = ( a + b )²]

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