(3x^2-xy+y^2)(3x^2+xy-y^2)
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Step-by-step explanation:
(3x²+xy-y²)(3xy-xy+y²)
=(3x²+xy-y²)[3x²-(xy-y²)]
It is of the form (a+b)(a-b)
Here a=3x² and b=xy-y²
Result is a²-b²
=(3x²)²-(xy-y²)²
=9x⁴-(x²y²+y⁴-2xy³)
=9x⁴+y⁴+2xy³-x²y²
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