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# How many marks will i get for this question? watch

1. The entire question was worth 5 marks

We got given the formula for the area of a semi circle and a rectangle attached to it, in terms of pie and r (radius) and it was equal to A.

Then it asked to prove that the greatest area of the shape was an expression, which they gave us.

I differentiated the equation they gave us, but got the wrong value of r (radius expression), meaning that I could never make it equal to the expression they told us to equal it to.

I differentiated correctly, and proved that it would be maximum, but rearranged to make subject r incorrectly, meaning I could not prove it at all.

How many marks would I get?
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Updated: February 21, 2018
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