(15)(5-4i)(3+2i)=

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Solution for (15)(5-4i)(3+2i)= equation:


Simplifying
(15)(5 + -4i)(3 + 2i) = 0

Multiply (5 + -4i) * (3 + 2i)
15(5(3 + 2i) + -4i * (3 + 2i)) = 0
15((3 * 5 + 2i * 5) + -4i * (3 + 2i)) = 0
15((15 + 10i) + -4i * (3 + 2i)) = 0
15(15 + 10i + (3 * -4i + 2i * -4i)) = 0
15(15 + 10i + (-12i + -8i2)) = 0

Combine like terms: 10i + -12i = -2i
15(15 + -2i + -8i2) = 0
(15 * 15 + -2i * 15 + -8i2 * 15) = 0
(225 + -30i + -120i2) = 0

Solving
225 + -30i + -120i2 = 0

Solving for variable 'i'.

Factor out the Greatest Common Factor (GCF), '15'.
15(15 + -2i + -8i2) = 0

Factor a trinomial.
15((5 + -4i)(3 + 2i)) = 0

Ignore the factor 15.

Subproblem 1

Set the factor '(5 + -4i)' equal to zero and attempt to solve: Simplifying 5 + -4i = 0 Solving 5 + -4i = 0 Move all terms containing i to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -4i = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -4i = 0 + -5 -4i = 0 + -5 Combine like terms: 0 + -5 = -5 -4i = -5 Divide each side by '-4'. i = 1.25 Simplifying i = 1.25

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 = {1.25, -1.5}

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