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In the olden days (1970's), we had charts to look up square roots that weren't perfect squares. ...or we memorized the ones that came up a lot like square root of 2 and 3.
Now (2012) you can just use a calculator: type in 21, then press the square root button which looks like a check mark with a horizontal line coming out from the top of the check mark. Sometimes it has an x under the horizontal line.
The answer will be in the calculator display.
OR...
If you know the perfect squares you can do a rudimentary calculation. 21 is between 16 and 25, so the answer will be between 4 and 5. Then you can do check and guess to get closer: 4.5 squared = 20.25, and 4.6 squared = 21.16, so the answer will be slightly more than 4.5. Now try 4.58 squared, which is 20.9764 & 4.59 squared is over 21, so the answer is between 4.58 & 4.59.
...and so on.
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Square root of 21?
The square root of 21 is 4.58257569495584.
What is the square root of 441?
21The square root of 441 is 21
Why is square root of 22 square plus root 23 equal to square root of 21 plus square root of 24?
It isn't. √22 + √23 = 9.486. √21 + √24 =9.482. its not that its more than that!!! its..... NOTHING!!! you got that??? NOTHING at all!!!
What is the actual answer of square root of 441?
441 has two square roots; 21 or -21.
Simplify the square root of 84?
Expressed as a surd, the square root of 84 is equal to 2 sqrt (21). √84 = √(4 x 21) = √4√21 = 2√21
What is the square root of 21?
The square root of 21 is 4.58257569495584.
Square root of 21?
The square root of 21 is 4.58257569495584.
Is 4.5 the square root of 21?
4.6 is a better approximation to the square root of 21.
What is the exact value for the expression the square root of 189 minus the square root of 21 plus the square root of 84 Simplify if possible.?
21
Multiply negative root 8 4 and 6 plus root 6 4?
Root 64 is 8, if by root you mean the square root. Then the problem become -square root 84(6+8) which is the - square root of 84(14) But square root of 84 is 2(square root of 21) so the final answer comes from -2(square root 21)x14 which is -28square root (21)
What is the square root of 441?
21The square root of 441 is 21
What is the square root of 21 Times Square root 15?
Your answer is: 17.7482393
How do you find square root of square 21?
The square root and square functions are inverse of one another EXCEPT that square root is not really a function: it is a 1-to-many mapping. So sqrt(square(21)) = sqrt(441) = ±21
What is the principle square root of 49 over 21 squared?
(√(a))²=a The square root and the square cancel to leave just 49/21■
Is negative square root of 21 irrational?
Yes, as is the positive square root.
How do you simplify the square root of 2205?
21 times the square root of 5.
What is the simplest radical from of the square root of 84?
First note that 84=4x21 and 4 is a perfect square. So square root of (84)=square root (4x21)=Square root (4) Square root (21)= 2 multiplied by the square root of 21. You can also write this using rational exponents, but this is not in radical form. It is an equivalent expression, however. 2 x (21)1/2
