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Δ=b²-4ac
13² - 4 * -6 * -6 =
169 - 4 * 36 =
169 - 144 =
25
√Δ = 5
x1 = -b-√Δ / 2
x2 = -b+√Δ / 2
x1 = -13+5 / 2 = 8/2 = 4
x2 = -13-5 / 2 = -18/2 = -9