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11-93.

Use a generic rectangle to see if x − 3 is a factor.

x2 − 2x + 5

(x − 3)(x2 − 2x + 5)

Use the factors to solve for x.

(x − 3)(x2 − 2x + 5)

x = 3

Use the quadratic formula to solve the other factor.

x = 1 ± 2i

x = {3, 1 ± 2i}