Q: What is a if the square root of 4a squared equals 21?

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(√(a))²=a The square root and the square cancel to leave just 49/21■

21.

If you mean 84 squared then it is 84*84 = 7056 If you mean the square root of 84 then it is 2 times the square root of 21 which is an irrational number

The square root of -21 is: 4.582576 i

The square root of 21 is 4.58257569495584.

The square root of 21 is 4.58257569495584.

x=1/2(-1-square root of 21) and x=1/2(square root of 21 -1)

As written, that's 4x squared = -21 and x equals the square root of -21/4. But if you meant that to be 12x, it factors out nicely to (2x + 3)(2x + 3) and x would equal -3/2

21The square root of 441 is 21

5*root(21^2) = 5*21 = 105

The square root of 410 equals 20.2485. 20.2485 is between the two integers, 20 and 21.

5 squared is 25, and 6 squared is 36.Because 31 lies between 25 and 36, the square root of 31 lies between 5 and 6.

√6 x √14 is the same as √(6x14). This equals √84, which can be simplified to 2√21.

The answer is 2. The square root of 2 (about 1.414) is the number that when squared (multiplied by itself) is equal to 2 --(if you multiply 1.414 times itself, it is actually 1.999). sqrt 2 x sqrt 2 = (21/2)2 = 21 = 2

4.6 is a better approximation to the square root of 21.

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)

Your answer is: 17.7482393

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) = Â±21

if you mean X²+8X-5=0: X1=-8/2 - Square root of ((8/2)²+5) X1=-4 - Square root of 21 X1 is about -8.58 X2=-8/2 + Square root of ((8/2)²+5) X2=-4 + Square root of 21 X2 is about 0.58

You just have to divide 441 by a few numbers until you get the same number you divided by. 441 divided by 10 is 44.1 so try 12. 441 divided by 12 is 36.75. Continuing this trial and error, you eventually find that 441/21 is equal to 21. Therefore 21 squared is 441; and the square root of 441 is 21. Or you just put in a calculator 441 and hit the squared button that looks like this: √

Yes, as is the positive square root.

21 times the square root of 5.

Equation: s^2 +4x -21 = 0 Completing the square: (s+2)^2 -4 -21 = 0 => (s+2)^2 = 25 Square root both sides: s+2 = +5 or -5 Subtract 2 from both sides: s = 3 or s = -7

21 km squared

Take the square root of both sides. x2 = 441 So x = 21