We have given the two equl sides value so we take in account this value and get the area only in terms of base . Now we get the base by finding the critical point . For this we take its derivative to be zero and get to be 10 units . So for this base the area will be maximum .
Now by taking the double derivatice we can check the found value is value at which the area gets maximise.
We have used basic derivative rules as
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