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(a) What is [- sqrt(144)]? (b) What is [sqrt(- 144)]? I think it is -12, but donot know (b)

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\[\sqrt{-144}=12i\] as it becomes imaginary if you take the root of a negative number.
b) is 12i where i is iota ...but its a complex no.
[- sqrt(144)] = -12

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Other answers:

[sqrt(- 144)] = 12 i
the first one is real but the second is imaginary
So [sqrt(- 144)] must not be a real number?
yes every sqrt(-number) = imaginary number
if you will get the nth root of a number wherein n is even,the answer is an imaginary number
given that the number inside the radical is negative

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