Identify the real and imaginary parts of each complex number.
$-4-9i$

In Exercises 21–28, divide and express the result in standard form.

3 / 4+i

In Exercises 21–28, divide and express the result in standard form.

2+3i / 2+i

In Exercises 29–36, simplify and write the result in standard form.

√−196

In Exercises 29–36, simplify and write the result in standard form.

√3² − 4 ⋅ 2 ⋅ 5

Identify the real and imaginary parts of each complex number.

$3+2i\sqrt3$

Write the complex number in standard form.

$\frac{9+\sqrt{-16}}{3}$

Find the difference. Express your answer in standard form.

$\left(2+8i\right)-\left(4-i\right)$

Find the sum. Express your answer in standard form.

$5\left(4+7i\right)+6\left(3-2i\right)$