Answer:
Step-by-step explanation:
2x²-13x+21+6x²+29x-5
=8x²+16x+16
If you are using a calculator, simply enter 16÷72×100 which will give you 22.22 as the answer.
To find the average rate of change, evaluate the function at the given points.
Evaluate the difference of the function at the given points.
Divide the difference of the function at the given points with the difference of the given points.
It's dependent on the context. A book may ask you to find the f'(x) of a function and you may have to use a u sub in your problem which requires you to find the dy/dx of what you substitute. So in this case both would be used.