(4-2i)(7+3i)=

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Solution for (4-2i)(7+3i)= equation: 


Simplifying
(4 + -2i)(7 + 3i) = 0

Multiply (4 + -2i) * (7 + 3i)
(4(7 + 3i) + -2i * (7 + 3i)) = 0
((7 * 4 + 3i * 4) + -2i * (7 + 3i)) = 0
((28 + 12i) + -2i * (7 + 3i)) = 0
(28 + 12i + (7 * -2i + 3i * -2i)) = 0
(28 + 12i + (-14i + -6i2)) = 0

Combine like terms: 12i + -14i = -2i
(28 + -2i + -6i2) = 0

Solving
28 + -2i + -6i2 = 0

Solving for variable 'i'.

Factor out the Greatest Common Factor (GCF), '2'.
2(14 + -1i + -3i2) = 0

Factor a trinomial.
2((2 + -1i)(7 + 3i)) = 0

Ignore the factor 2.

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

Simplifying
2 + -1i = 0

Solving
2 + -1i = 0

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

Add '-2' to each side of the equation.
2 + -2 + -1i = 0 + -2

Combine like terms: 2 + -2 = 0
0 + -1i = 0 + -2
-1i = 0 + -2

Combine like terms: 0 + -2 = -2
-1i = -2

Divide each side by '-1'.
i = 2

Simplifying
i = 2

Subproblem 2
Set the factor '(7 + 3i)' equal to zero and attempt to solve:

Simplifying
7 + 3i = 0

Solving
7 + 3i = 0

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

Add '-7' to each side of the equation.
7 + -7 + 3i = 0 + -7

Combine like terms: 7 + -7 = 0
0 + 3i = 0 + -7
3i = 0 + -7

Combine like terms: 0 + -7 = -7
3i = -7

Divide each side by '3'.
i = -2.333333333

Simplifying
i = -2.333333333
Solution
i = {2, -2.333333333}

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