,

The percentage rate of change for the function is the value of the derivative (rate of change) at over the value of the function at .

Substitute the functions into the formula to find the function for the percentage rate of change.

Factor out of .

Factor out of .

Factor out of .

Factor out of .

Factor out of .

Factor out of .

Evaluate the formula at .

Add and .

Multiply.

Multiply by .

Multiply by .

Add and .

Convert to a decimal.

Convert to a percentage.

%

Find the Percentage Rate of Change f(x)=x^2+2x , x=1