Secant lines & average rate of change with arbitrary points (with simplification)

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Problem

f, left parenthesis, x, right parenthesis, equals, x, start superscript, 2, end superscript, minus, 2, x, plus, 5
What is the average rate of change of f over the interval minus, 1, is less than or equal to, x, is less than or equal to, t, in terms of t, where t, does not equal, minus, 1?
Your answer must be fully expanded and simplified.
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