christian-king_60b20da9264c3
christian-king_60b20da9264c3
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1) x² - 8x + 15 = 0 (-8)² - 4 . 1 . 15 64 - 60 4 [-(-8) ± â4)] / (2 . 1) (8 ± 2) / 2 x = 4 ± 1 x' = 5 x" = 3 2) 2x² - 32 = 0 x² - 16 = 0 x² = 0 + 16 x² = 16 x =±â16 x = ±4 3)x²-25=0 x² = 25 x = â…