(6-4i)(-4-5i)=

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Solution for (6-4i)(-4-5i)= equation:


Simplifying
(6 + -4i)(-4 + -5i) = 0

Multiply (6 + -4i) * (-4 + -5i)
(6(-4 + -5i) + -4i * (-4 + -5i)) = 0
((-4 * 6 + -5i * 6) + -4i * (-4 + -5i)) = 0
((-24 + -30i) + -4i * (-4 + -5i)) = 0
(-24 + -30i + (-4 * -4i + -5i * -4i)) = 0
(-24 + -30i + (16i + 20i2)) = 0

Combine like terms: -30i + 16i = -14i
(-24 + -14i + 20i2) = 0

Solving
-24 + -14i + 20i2 = 0

Solving for variable 'i'.

Factor out the Greatest Common Factor (GCF), '2'.
2(-12 + -7i + 10i2) = 0

Factor a trinomial.
2((-4 + -5i)(3 + -2i)) = 0

Ignore the factor 2.

Subproblem 1

Set the factor '(-4 + -5i)' equal to zero and attempt to solve: Simplifying -4 + -5i = 0 Solving -4 + -5i = 0 Move all terms containing i to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + -5i = 0 + 4 Combine like terms: -4 + 4 = 0 0 + -5i = 0 + 4 -5i = 0 + 4 Combine like terms: 0 + 4 = 4 -5i = 4 Divide each side by '-5'. i = -0.8 Simplifying i = -0.8

Subproblem 2

Set the factor '(3 + -2i)' equal to zero and attempt to solve: Simplifying 3 + -2i = 0 Solving 3 + -2i = 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 + -2i = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -2i = 0 + -3 -2i = 0 + -3 Combine like terms: 0 + -3 = -3 -2i = -3 Divide each side by '-2'. i = 1.5 Simplifying i = 1.5

Solution

i = {-0.8, 1.5}

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