100 metres of fencing are available to enclose a rectangular pen. The area, A square metres, enclosed is given by A = 25x - x^2 where the length of the pen is x metres,
a) What is maximum area that can be enclosed?
b) What are the dimensions of the pen with maximum area?

Girardo is using the model below to solve the equation . girardo uses the following steps: step 1 add 4 negative x-tiles to both sides step 2 add 1 negative unit tile to both sides step 3 the solution is which step could be adjusted so that gerardo's final step results in a positive x-value? in step 1, he should have added 4 positive x-tiles to both sides. in step 1, he should have added 3 negative x-tiles to both sides. in step 2, he should have added 4 negative unit tiles to both sides. in step 2, he should have added 1 positive unit tile to both sides.