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  • Brainly User
2015-09-02T10:46:54+05:30

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(a+b)² = a²+b²+2ab
so (x+y)² =x²+y²+2xy
now compare it 
(x²)²+(y²)²+2x²y²
a=x² and b =y²
(a+b)²=(x²+y²)²=x^4+y^4+2x²y²
so (x²+y²)² is a factor of this equation 
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