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What is it telling me to do

What is it telling me to do-example-1
User HTF
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This problem gives you the area of a square, and asks for the length of a side. The formula for the area
A of a square, knowing the side
s, is


A = s^2

But we are in the opposite situation: we know the area and we are looking for the side. So, we need to invert the formula above:


s = \pm√(A)

But since the length of a side can't be negative, we choose


s = √(A)

So, if we plug the value for the area, we have


s = √(20.25) = 4.5

User Richard Stokes
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