You"re not dumb, however it is time come memorize fairly a couple of of the perfect squares, i.e. Numbers who square root are optimistic integers--because these figure in a lot of math applications.

You are watching: What is the square root of 121

In a pinch, you can constantly use a calculator to find the square source of any kind of positive integer; if the result is an additional integer, then you were handling a perfect square--otherwise the non-integer square source of an creature is just an approximate decimal worth for an IRRATIONAL number.
Examples: Square roots of 3, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15, 17, etc. Room irrational (not integers due to the fact that this list includes NO perfect square integers).
Note The remedies to x2 = 121 space ±11 yet THIS does NOT average THAT THE SQUARE source OF121 IS -11.
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