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⇔ x² - x - 6
2. (2x - 3) (x + 4) = 2x² - 3x + 8x - 12
⇔ 2x² + 5x -12
3. (3m + 2n) (3m - 2n) = 9m² + 6mn - 6mn - 4n²
⇔ 9m² - 4n²
4. (3 - a) (5 + a) = 15 - 5a + 3a - a²
⇔ 15 - 2a - a²
2.(2x-3)(x+4)=2x pngkt 2+8x-3x-12=2x pngkt2+5x-12
3.(3m+2n)(3m-2n)=9m pngkt 2-6mn+6nm-4n pngkt 2=9m pngkt 2-4n pngkt 2
4.(3-a)(5+a)=15+3a-5a-a pngkt 2=-a pngkt 2-2a+15