4.6 is a better approximation to the square root of 21.
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
(√(a))²=a The square root and the square cancel to leave just 49/21■
21 times the square root of 5.
The square root of 21 is 4.58257569495584.
The square root of 21 is 4.58257569495584.
4.6 is a better approximation to the square root of 21.
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)
21The square root of 441 is 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) = ±21
(√(a))²=a The square root and the square cancel to leave just 49/21■
Yes, as is the positive square root.
21 times the square root of 5.
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