Exercises 7-22: Solve each equation and inequality. Use set-builder or interval notation to write solution sets to the inequalities. 7. (a) x² - x – 12 = 0 8. (a) x² - 8x + 12 = 0 (b) x² - x - 12 < 0 (b) x - 8x + 12 < 0 (c) x² - x - 12 > 0 (c) x² - 8x + 12 >0 9. (a) k² – 4 = o 10. (a) n – 17 = o (b) k² – 4 s 0 (b) - 17 s 0 (c) k² – 4 z 0 (c) n² – 17 z 0

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