1) 5x² + 4x - 1 = 0; 2) 3x² + 10x + 7 = 0; 3) 16x² - 2x - 5 = 0; 4) -7x² - 4x + 11 = 0; 5) 28x² - 36x + 11 = 0; 6) -23x² - 22x + 1 = 0; 7) -49x² + 21x - 2 = 0; 8) 3x² - 14x + 16 = 0. HELP PLESE!!! HELP PLESE!!! HELP PLESE!!!
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