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A = 1 b = 4 c = 5 x1 = (4 + √ - 4 ^ 2 - 4(1)( - 5) ) / 2(1) = 5 x2 = (4 - √ - 4 ^ 2 - 4(1)( - 5) ) / 2(1) = - 1.

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A = 1 b = 4 c = 5

x1 = (4 + √ - 4 ^ 2 - 4(1)( - 5) ) / 2(1) = 5

x2 = (4 - √ - 4 ^ 2 - 4(1)( - 5) ) / 2(1) = - 1.