algebra
posted by rita on .
ceate a quadratic equation with the given solutions 8i and 9i

not possible!
For any quadratic, complex roots always come in pairs of conjugates, i.e., if one root is 8i, then there has to be a root of 8i
so your quadratic would need 4 roots.
Quadratics have at most 2 roots.
So, a bogus question