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Example - 2. Solve 2x² - x - 1 = 0

Solution : 2x² - x - 1 = 0

Or, 2x² + x - 2x - 1 = 0

Or, x (2x + 1) - 1(2x + 1) = 0

Or, (2x + 1) (x - 1) = 0