The square root of 4 is 2.
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Surds are based on roots. Root 8 can be split into root 4 and root 2; as there's a root to 4, get that number, and multiply it by the remaining root. So root 8 = 2 root 2. Root 40 would be 2 root 10 Root 48 would be root 4, root 4, root 3 Root 48 = 4 root 3.
4 square root 3 + 4 cube root 3 is 12.6972015
9 square root 4 minus 12 square root 4 = -6
the square root of 4 is 2 square root 2
4 square root of -9 = 4 square root of (-1)(9) = 4 square root of (i29) = 4(3i) = 12i