(x + y^2 - P) x (x² + y² - P x)
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(x + y² -p) × (x² + y² - px)
=x(x² + y² - p) + y²(x² + y² - p) -p(x² + y² - p)
= x³ + xy² - px + x²y² + y⁴ - py² - px² - py² + p²
= x³ + xy² - px + x²y² + y⁴ - 2py² - px² + p²
hope it helps you
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