factories X4+Y4-7x2y2
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Answer: Please see answer in the given below pic
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x⁴ + y⁴ - 7x²y²
= [(x²)² + (y²)² -2x²y² ]-5x²y²
= (x²-y²)² - ( √5xy )²
= (x²-y²+√5xy)(x²-y²-√5xy)
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