(3-21i)(7-I)=

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Solution for (3-21i)(7-I)= equation:


Simplifying
(3 + -21i)(7 + -1I) = 0

Multiply (3 + -21i) * (7 + -1I)
(3(7 + -1I) + -21i * (7 + -1I)) = 0
((7 * 3 + -1I * 3) + -21i * (7 + -1I)) = 0
((21 + -3I) + -21i * (7 + -1I)) = 0
(21 + -3I + (7 * -21i + -1I * -21i)) = 0
(21 + -3I + (-147i + 21iI)) = 0
(21 + -3I + -147i + 21iI) = 0

Solving
21 + -3I + -147i + 21iI = 0

Solving for variable 'I'.

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

Add '-21' to each side of the equation.
21 + -3I + -147i + -21 + 21iI = 0 + -21

Reorder the terms:
21 + -21 + -3I + -147i + 21iI = 0 + -21

Combine like terms: 21 + -21 = 0
0 + -3I + -147i + 21iI = 0 + -21
-3I + -147i + 21iI = 0 + -21

Combine like terms: 0 + -21 = -21
-3I + -147i + 21iI = -21

Add '147i' to each side of the equation.
-3I + -147i + 147i + 21iI = -21 + 147i

Combine like terms: -147i + 147i = 0
-3I + 0 + 21iI = -21 + 147i
-3I + 21iI = -21 + 147i

Reorder the terms:
21 + -3I + -147i + 21iI = -21 + 147i + 21 + -147i

Reorder the terms:
21 + -3I + -147i + 21iI = -21 + 21 + 147i + -147i

Combine like terms: -21 + 21 = 0
21 + -3I + -147i + 21iI = 0 + 147i + -147i
21 + -3I + -147i + 21iI = 147i + -147i

Combine like terms: 147i + -147i = 0
21 + -3I + -147i + 21iI = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(7 + -1I + -49i + 7iI) = 0

Ignore the factor 3.

Subproblem 1

Set the factor '(7 + -1I + -49i + 7iI)' equal to zero and attempt to solve: Simplifying 7 + -1I + -49i + 7iI = 0 Solving 7 + -1I + -49i + 7iI = 0 Move all terms containing I to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -1I + -49i + -7 + 7iI = 0 + -7 Reorder the terms: 7 + -7 + -1I + -49i + 7iI = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1I + -49i + 7iI = 0 + -7 -1I + -49i + 7iI = 0 + -7 Combine like terms: 0 + -7 = -7 -1I + -49i + 7iI = -7 Add '49i' to each side of the equation. -1I + -49i + 49i + 7iI = -7 + 49i Combine like terms: -49i + 49i = 0 -1I + 0 + 7iI = -7 + 49i -1I + 7iI = -7 + 49i The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined. The solution to this equation could not be determined.

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