D = 96² + 4*7*28 = 9216 + 784 = 10000
√D = 100
x₁ = (96 + 100)/14 = 14
x₂ = (96 - 100)/14 = -4/14 = -2/7
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D = 96² + 4*7*28 = 9216 + 784 = 10000
√D = 100
x₁ = (96 + 100)/14 = 14
x₂ = (96 - 100)/14 = -4/14 = -2/7