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Step-by-step explanation:
Add one to both sides of the equation:
[tex]x^2 - 2x + 1 = 15 + 1[/tex]
[tex]\Rightarrow (x - 1)^2 = 16[/tex]
Taking the square root of the equation above, we get
[tex]x - 1 = \pm 4[/tex]
or
[tex]x = 1 \pm 4 = 5, -3[/tex]