4.6 is a better approximation to the square root of 21.
3 times the square root of 5
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
It is 2*sqrt(5).
(√(a))²=a The square root and the square cancel to leave just 49/21■
The square root of 21 is 4.58257569495584.
Square root of 45 times square root of 45 = 45
45 is the square root of 2,025 (45 x 45 = 2025).
The square root of 21 is 4.58257569495584.
√45 = 6.708203932499369
The square root of 45 in simplest form is 3sqrt(5). You take the 2 roots from 45 (5 and 9) and find out the square root of 9 is 3, while the square root of 5 is still just square root 5.
3 times the square root of 5
45+45+90
21
45
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