(9+5i)(4-2i)=

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Solution for (9+5i)(4-2i)= equation:


Simplifying
(9 + 5i)(4 + -2i) = 0

Multiply (9 + 5i) * (4 + -2i)
(9(4 + -2i) + 5i * (4 + -2i)) = 0
((4 * 9 + -2i * 9) + 5i * (4 + -2i)) = 0
((36 + -18i) + 5i * (4 + -2i)) = 0
(36 + -18i + (4 * 5i + -2i * 5i)) = 0
(36 + -18i + (20i + -10i2)) = 0

Combine like terms: -18i + 20i = 2i
(36 + 2i + -10i2) = 0

Solving
36 + 2i + -10i2 = 0

Solving for variable 'i'.

Factor out the Greatest Common Factor (GCF), '2'.
2(18 + i + -5i2) = 0

Factor a trinomial.
2((2 + -1i)(9 + 5i)) = 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 '(9 + 5i)' equal to zero and attempt to solve: Simplifying 9 + 5i = 0 Solving 9 + 5i = 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 + 5i = 0 + -9 Combine like terms: 9 + -9 = 0 0 + 5i = 0 + -9 5i = 0 + -9 Combine like terms: 0 + -9 = -9 5i = -9 Divide each side by '5'. i = -1.8 Simplifying i = -1.8

Solution

i = {2, -1.8}

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