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There is nothing called as the value of a complex number. but there is something called the absolute value of a complex number which is actually the distance of the complex number from the origin in the argand plane. the absolute value of a complex number is:-
|a+ib|= \sqrt{a^2+b^2}
therefore |\sqrt{2}-3i|=\sqrt{2+9}=\sqrt{11}
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Absolute value of 2^1/2-3i=(2^1/2^2+(-3)^2)    (since,abs. value of a+bi=(a^2+b^2))
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