f(x) = -x2 + 20x -40
x = -b2a = -202(-1) = 10
f(10) =-(10)2 + 20(10)-40
f(10) =-20+200 - 40 f(10)=140
Maximum at (10,140)
1. Identify the error made in the solved problem.
2. Correctly solve/simplify the problem showing all the steps. Be sure to include any formulas or properties that support the correctly solved problem.
3. Write a few sentences explaining how to avoid making this mistake in future practice.
4. Reply to other students agreeing or disagreeing with your responses, and add any additional advice to avoid making these types of mistakes in future practice.