Evaluate sum from n=3 to 12 of -5n-1

Math
Split the summation to make the starting value of equal to .
Evaluate .
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Split the summation into smaller summations that fit the summation rules.
Evaluate .
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The formula for the summation of a polynomial with degree is:
Substitute the values into the formula and make sure to multiply by the front term.
Simplify.
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Add and .
Multiply by .
Divide by .
Multiply by .
Evaluate .
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The formula for the summation of a constant is:
Substitute the values into the formula.
Simplify.
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Remove parentheses.
Multiply by .
Add the results of the summations.
Subtract from .
Evaluate .
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Expand the series for each value of .
Simplify.
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Simplify each term.
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Multiply by .
Multiply by .
Simplify by subtracting numbers.
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Subtract from .
Subtract from .
Subtract from .
Replace the summations with the values found.
Add and .
Evaluate sum from n=3 to 12 of -5n-1

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