Hello.
The solutions found to radical equations are not necessarily viable. They sometimes result in inequalities, and have to be checked.
Hope I helped.
Maximum area of the rectangle is 
<u>Explanation:</u>
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Considering the dimensions to be in cm

Putting the value of x = 3

Therefore, maximum area of the rectangle is 
If i simplify number 6 it would be -55/63
For f(10) replace x with 10 then solve:
f10) = 10^2 + 1
= 100 +1
= 101