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Δ=b²-4ac = 144 -4 *(-32) = 144 + 128 = 272
√Δ = 4√17
x1 = (-12-4√17):2 = -4(3+√17):2 = -2(3+√17)
x2 = (-12+4√17):2 = -2(3-√17)
odp. x = -2(3+√17) lub x=-2(3-√17)