(3x - 1)² - (x - 2)² = 15
9x² - 6x + 1 - x² + 4x - 4 - 15 = 0
8x² - 2x - 18 = 0
4x² - x - 9 = 0
D = (- 1)² - 4 * 4 * (- 9) = 1 + 144 = 145
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(3x - 1)² - (x - 2)² = 15
9x² - 6x + 1 - x² + 4x - 4 - 15 = 0
8x² - 2x - 18 = 0
4x² - x - 9 = 0
D = (- 1)² - 4 * 4 * (- 9) = 1 + 144 = 145