$\sqrt { - 2} \,\sqrt { - 3} = $
$\sqrt 6 $
$ - \sqrt 6 $
$i\sqrt 6 $
None of these
(b) $\sqrt { – 2} \sqrt { – 3} = i\sqrt 2 \,i\,\sqrt 3 = {i^2}\sqrt 6 = – \sqrt 6 $ .
If $\left| {z – 3i} \right| \le 5$ , then minimum value of $| z + 2 |$ is equal to
Solve the equation $3 x^{2}-4 x+\frac{20}{3}=0$
Solve the equation $x^{2}+3=0$
Let $z$ be a complex number such that the imaginary part of $z$ is non zero and $a=z^2+z+1$ is real. Then a cannot take the value
Let $z = 1 + ai$ be a complex number, $a > 0$, such that $z^3$ is areal number. Then the sum $1 + z + z^2 + …. + z^{11}$ is equal to
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