# Let \[ I = \int {\sqrt {5 – 2x + {x^2}} } dx = \int {\sqrt {{x^2} – 2x + 1 + 4} } dx\]

\[ = \int {\sqrt {{{(x – 1)}^2} + {{(2)}^2}} } dx = \int {\sqrt {{{(2)}^2} + {{(x – 1)}^2}} } dx\]

# \[ = \frac{{x – 1}}{2}\sqrt {{2^2} + {{(x – 1)}^2}} + 2\log \left| {x – 1 + \sqrt {{2^2} + {{(x – 1)}^2}} } \right| + C\]

# \[ = \frac{{x – 1}}{2}\sqrt {5 – 2x + {x^2}} + 2\log \left| {x – 1 + \sqrt {5 – 2x + {x^2}} } \right| + C\]

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