Simplify Radical Expressions and Complex Numbers

Simplify the following expression:

(-2+6i)(2-6i)

Simplify the following expression:

Simplify the following expression

Simplify the radical expression.

Simplify. Express answer in $$a+bi$$ form.

$$\left(17+\sqrt[]{-162}\right)+\left(-9+\sqrt[]{-98}\right)$$

Step 1 - Rewrite the negative radicals: $$17\ +$$ ​ (a)   $$-9\ +$$ ​ (b)  

Step 2 - Combine like terms: ​ (c)   $$+$$ ​ (d)  

Simplify. Express your answer in $$a+bi$$ form.

$$\left(-13i\ +8\right)-76$$

*Type answer with NOSPACES!

(a)  

Simplify. Answer in $$a+bi$$ form.

$$\left(-9.8i-4.1\right)+2\left(4.2-3.4i\right)+6.7i$$

In order to ​ (a)   complex numbers, you must multiply both the numerator and denominator of your fraction by the​ ​ (b)   of the ​​ (c)   in order to ​ (d)   the denominator.​

Complete the steps to simplify $$\frac{2+7i}{-3i}$$

Simplify √96