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sqrt(324) = ±1818the square root is 18
If you mean, the square root of 4 multiplied by the square root of 5, that is 2x5=10
If you mean, the square root of ( 4x25), that is the square root of 100 which is 10
If you mean (Ab)2 then it is Ab, but if you mean Ab2 then it is square root (A)(b).
The principal square root is the non-negative square root.
You mean square root of 25? (Answer: 5)