What 2 square numbers subtract to make 243?

What two square numbers subtract to make 243? In other words, when you subtract one square number from another square number, the answer is 243. What are the two square numbers?

First, note that a square number is what you get when you multiply a number by itself, which means that the square root of a square number will equal a whole number. Thus, this is what we are solving:

A² - B² = 243

We solved the equation above and found this to be true:

18² - 9² = 243

18² is 324 and 9² is 81, therefore the answer to the question "What 2 square numbers subtract to make 243?" is 324 and 81 as illustrated below:

324 - 81 = 243

Note that there may be more than one solution to a problem like this. Above, we found the lowest combination of square numbers that subtract to 243. Below we list alternate solutions if available.

1764 - 1521 = 243
14884 - 14641 = 243

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