You"re not dumb, yet it is time come memorize rather a couple of of the perfect squares, i.e. Numbers whose square roots are hopeful integers--because these figure in a many of mathematics applications.

You are watching: Is the square root of 121 rational


In a pinch, you can constantly use a calculator to discover the square root of any type of positive integer; if the an outcome is another integer, climate you were managing a perfect square--otherwise the non-integer square source of an integer is just an approximate decimal worth for an IRRATIONAL number.
Examples: Square root of 3, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15, 17, etc. Are irrational (not integers because this list has NO perfect square integers).
Note The options to x2 = 121 are ±11 however THIS does NOT mean THAT THE SQUARE source OF121 IS -11.
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