(1+3i)(-3-2i)=

Solution for (1+3i)(-3-2i)= equation:

Simplifying
(1 + 3i)(-3 + -2i) = 0

Multiply (1 + 3i) * (-3 + -2i)
(1(-3 + -2i) + 3i * (-3 + -2i)) = 0
((-3 * 1 + -2i * 1) + 3i * (-3 + -2i)) = 0
((-3 + -2i) + 3i * (-3 + -2i)) = 0
(-3 + -2i + (-3 * 3i + -2i * 3i)) = 0
(-3 + -2i + (-9i + -6i2)) = 0

Combine like terms: -2i + -9i = -11i
(-3 + -11i + -6i2) = 0

Solving
-3 + -11i + -6i2 = 0

Solving for variable 'i'.

Factor out the Greatest Common Factor (GCF), '-1'.
-1(3 + 11i + 6i2) = 0

Factor a trinomial.
-1((3 + 2i)(1 + 3i)) = 0

Ignore the factor -1.
Subproblem 1
Set the factor '(3 + 2i)' equal to zero and attempt to solve:

Simplifying
3 + 2i = 0

Solving
3 + 2i = 0

Move all terms containing i to the left, all other terms to the right.

Add '-3' to each side of the equation.
3 + -3 + 2i = 0 + -3

Combine like terms: 3 + -3 = 0
0 + 2i = 0 + -3
2i = 0 + -3

Combine like terms: 0 + -3 = -3
2i = -3

Divide each side by '2'.
i = -1.5

Simplifying
i = -1.5
Subproblem 2
Set the factor '(1 + 3i)' equal to zero and attempt to solve:

Simplifying
1 + 3i = 0

Solving
1 + 3i = 0

Move all terms containing i to the left, all other terms to the right.

Add '-1' to each side of the equation.
1 + -1 + 3i = 0 + -1

Combine like terms: 1 + -1 = 0
0 + 3i = 0 + -1
3i = 0 + -1

Combine like terms: 0 + -1 = -1
3i = -1

Divide each side by '3'.
i = -0.3333333333

Simplifying
i = -0.3333333333
Solution
i = {-1.5, -0.3333333333}