"x squared equals to 25" is not an inequality! You need to re-think the question!
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52 = 25
If the 64 has a minus sign, then the solution is x = +/-5 Simplifying gives 4x squared = 100 ie x squared = 25...
If: x2+16 = 25 Then: x = 3
5 squared equals 25. This is because 5*5 = 25. The definition of squared means you are multiplying a number times itself.
.25 square meters = 2.7 square feet.