The roots of $a{x^2} + bx + c = 0$ ,where $a \ne 0$ ,b,c are non-real complex and

$a + c < b$ , then

  $\left ( 2 \sqrt{3} - 2 i \right ) \left ( - 2 \sqrt{3} + 6 i \right )$ এর পোলার আকার হলো?

If $(x^{2}-2)+(y+3)i=7+4i$  then x and y are 

Let $P(e^{i\theta_1})$, $Q(e^{i\theta_2})$ and $R(e^{i\theta_3})$ be the vertices of a triangle PQR in the Argand Plane. The orthocenter of the triangle PQR is