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a² - 18ab - 81b² - a⁴b²
25x² - x² - 2xy - y² = 24x² + 2xy + y²
100 - 9x² - 42xy - 49y²
a² +4ab + 4b² + 9c²+ 24cd + 16d²
4x² + 12x + 9 - x²+ 2x - 1
a^2 - 18ab - 81b^2 - a^4*b^2
25x^2 - x^2 - 2xy - y^2 = 24x^2 + 2xy + y^2
100 - 9x^2 - 42xy - 49y^2
a^2 +4ab + 4b^2 + 9c^2+ 24cd + 16d^2
4x^2 + 12x + 9 - x^2+ 2x - 1