# Find the Linearization at a f(x)=12x^2+8x , x=9

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Consider the function used to find the linearization at .
Substitute the value of into the linearization function.
Evaluate .
Replace the variable with in the expression.
Simplify .
Remove parentheses.
Simplify each term.
Raise to the power of .
Multiply by .
Multiply by .
Find the derivative and evaluate it at .
Find the derivative of .
By the Sum Rule, the derivative of with respect to is .
Evaluate .
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 .
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.
Simplify.
Multiply by .