What 2 square numbers subtract to make 391?

What two square numbers subtract to make 391? In other words, when you subtract one square number from another square number, the answer is 391. 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 = 391

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

20² - 3² = 391

20² is 400 and 3² is 9, therefore the answer to the question "What 2 square numbers subtract to make 391?" is 400 and 9 as illustrated below:

400 - 9 = 391

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 391. Below we list alternate solutions if available.

38416 - 38025 = 391

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