(6+3i)(9-i)=

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Solution for (6+3i)(9-i)= equation:


Simplifying
(6 + 3i)(9 + -1i) = 0

Multiply (6 + 3i) * (9 + -1i)
(6(9 + -1i) + 3i * (9 + -1i)) = 0
((9 * 6 + -1i * 6) + 3i * (9 + -1i)) = 0
((54 + -6i) + 3i * (9 + -1i)) = 0
(54 + -6i + (9 * 3i + -1i * 3i)) = 0
(54 + -6i + (27i + -3i2)) = 0

Combine like terms: -6i + 27i = 21i
(54 + 21i + -3i2) = 0

Solving
54 + 21i + -3i2 = 0

Solving for variable 'i'.

Factor out the Greatest Common Factor (GCF), '3'.
3(18 + 7i + -1i2) = 0

Factor a trinomial.
3((9 + -1i)(2 + i)) = 0

Ignore the factor 3.

Subproblem 1

Set the factor '(9 + -1i)' equal to zero and attempt to solve: Simplifying 9 + -1i = 0 Solving 9 + -1i = 0 Move all terms containing i to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -1i = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -1i = 0 + -9 -1i = 0 + -9 Combine like terms: 0 + -9 = -9 -1i = -9 Divide each side by '-1'. i = 9 Simplifying i = 9

Subproblem 2

Set the factor '(2 + i)' equal to zero and attempt to solve: Simplifying 2 + i = 0 Solving 2 + i = 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 + i = 0 + -2 Combine like terms: 2 + -2 = 0 0 + i = 0 + -2 i = 0 + -2 Combine like terms: 0 + -2 = -2 i = -2 Simplifying i = -2

Solution

i = {9, -2}

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