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1) x≠-1 34x² - 23x = x² - 4 33x² - 23x + 4 = 0 D = 529 - 528 = 1 x₁ = (23 - 1)/66 = 22/66 = 1/3 x₂ = (23 + 1)/66 = 24/66 = 4/11 2) x≠2 2x² - 21 = 5x - 2x² 4x² - 5x - 21 = 0 D = 25 + 336 = 361 x₁ = (5-19)/8 = -14/8 = -1,75 x₂ = (5+19)/8 = 24/8 = 3 3) x≠-3 4 - 8x = 34x² + x 34x² + 9x - 4 = 0 D = 81 + 544 = 625 x₁ = (-9-25)/68 = -34/68 = -0.5 x₂ = (-9+25)/68 = 16/68 = 4/17 4) x≠5 18 - 6x² = x² - 15x 7x² - 15x - 18 = 0 D = 225 + 504 = 729 x₁ = (15-27)/14 = -12/14 = -6/7 x₂ = (15+27)/14 = 42/14 = 3