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

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

Simplifying
(3 + 7i)(2 + -1i) = 0

Multiply (3 + 7i) * (2 + -1i)
(3(2 + -1i) + 7i * (2 + -1i)) = 0
((2 * 3 + -1i * 3) + 7i * (2 + -1i)) = 0
((6 + -3i) + 7i * (2 + -1i)) = 0
(6 + -3i + (2 * 7i + -1i * 7i)) = 0
(6 + -3i + (14i + -7i2)) = 0

Combine like terms: -3i + 14i = 11i
(6 + 11i + -7i2) = 0

Solving
6 + 11i + -7i2 = 0

Solving for variable 'i'.

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

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 '(3 + 7i)' equal to zero and attempt to solve:

Simplifying
3 + 7i = 0

Solving
3 + 7i = 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 + 7i = 0 + -3

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

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

Divide each side by '7'.
i = -0.4285714286

Simplifying
i = -0.4285714286
Solution
i = {2, -0.4285714286}