adrian-saunders_60960872f0e2a
adrian-saunders_60960872f0e2a
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x² - 4x = 5 â x² - 4x - 5 = 0 a = 1 b = - 4 c = - 5 Î = b² - 4ac â Î = (-4)² - 4(1)(-5) â Î = 16 + 20 â Î = 36 â Raiz quadrada nos 2 lados â âÎ = â36 â âÎ = 6 x = (-b ± âÎ) / 2a â Como âÎ = 6 â…