Evaluate the Derivative at x=7 f(x)=8x^2+11x , x=7

Math
,
Find the derivative.
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By the Sum Rule, the derivative of with respect to is .
Evaluate .
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Since is constant with respect to , the derivative of with respect to is .
Differentiate using the Power Rule which states that is where .
Multiply by .
Evaluate .
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Since is constant with respect to , the derivative of with respect to is .
Differentiate using the Power Rule which states that is where .
Multiply by .
Replace the variable with in the expression.
Multiply by .
Add and .
Evaluate the Derivative at x=7 f(x)=8x^2+11x , x=7

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