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How would the expression (x^2+1)(y^2+4) be written using two square?

How would the expression (x^2+1)(y^2+4) be written using two square?
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How would the expression (x^2+1)(y^2+4) be written using two square?

User John Dorner
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x²y² + 4x² + 1y² + 4
=x² (y² + 4) + 1 (y² + 4)
=(y² + 4)(x² + 1)
User Hamiltonia
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