amanda-walsh_60a6c2852a3a3
amanda-walsh_60a6c2852a3a3
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4x² + 4x - 15 = 0 Delta = b² - 4.a.c Delta = (-4)² - 4.4.(-15) Delta = 16 + 240 Delta = 256 x = -b +/- ²vDelta/2a x = -4 +/- ²v256/2.4 x = -4 +/- 16/8 x = -1 +/- 4/2 x' = -1 + 4/2 x' = 3/2 x'' = -1 - 4/2 x'' = -5/2