Chapter 4 Quadratic Functions and Factoring - Chapter Review - Page 321: 29

$$ -18i-9 $$

For imaginary numbers, we know that standard form is $a\pm bi$, where $a$ is the real part and $b$ is the imaginary part. We also know that $i^2=-1$. Thus, we simplify the expression until it is in standard form to obtain: $$ -18i-9 $$