You can get these quickly with Excel, or a similar spreadsheet program. In column A, write 1, 2, 3, ... downward. In Excel, after typing 1 and 2, you can select the two cells and drag the corner (a little black square) downward) to quickly get additional numbers.Next, in cell B1, type:
=sqrt(A1)
Then copy this cell downward.
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15 and -15
+15 and -15.
Because some of them are squares of rational numbers. So their square roots are the rational numbers.Thus if x is rational, then the square roots of x2, which are -x and +x are both rational.
225 is a square number.
The area is 225 square feet!