# Summary

- A complex
*z*is of the form*a*+*ib*where*a*and*b*are real and - If

- In general,
- Conjugate of a complex number
*z*=*a*+*ib*is is the polar form of a complex number, where*z*=*r*(cos Î¸ +*i*sin Î¸ )andis the argument of z.*Î¸*- A polynomial equation p(x) = 0 of degree n, has n roots.
- The complex roots of a polynomial equation always occur as a conjugate pair.
- The reciprocal of a complex number
*z*is the same as its conjugate - The solutions of quadratic equation