(x-2)(x+1) - x²-x-2, (x+13)(x-13) - x²-169, (x+1)(x+4) - x²+5x+4, (2x+5)(2x-5) - 4x²-25, (3x+1)(3x-1) - 9x²-1, (x+9)(x-9) - x²-81, (x+4)(x-4) - x²-16, (x+11)² - x²+22x+121, (x-6)² - x²-12x+36, (x+12)(x-1) - x²+11x-12, (x+3)(x-3) - x²-9, (x+15)² - x²+30x+225, (x+9)² - x²+18x+81, (x+5)(x-5) - x²-25, (x+4)² - x²+8x+16, (x_14)² - x²-28x+196,

Quadratic factorisation

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