(5i)(-7i)(2+8i)=

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Solution for (5i)(-7i)(2+8i)= equation:


Simplifying
(5i)(-7i)(2 + 8i) = 0

Remove parenthesis around (5i)
5i(-7i)(2 + 8i) = 0

Remove parenthesis around (-7i)
5i * -7i(2 + 8i) = 0

Reorder the terms for easier multiplication:
5 * -7i * i(2 + 8i) = 0

Multiply 5 * -7
-35i * i(2 + 8i) = 0

Multiply i * i
-35i2(2 + 8i) = 0
(2 * -35i2 + 8i * -35i2) = 0
(-70i2 + -280i3) = 0

Solving
-70i2 + -280i3 = 0

Solving for variable 'i'.

Factor out the Greatest Common Factor (GCF), '-70i2'.
-70i2(1 + 4i) = 0

Ignore the factor -70.

Subproblem 1

Set the factor 'i2' equal to zero and attempt to solve: Simplifying i2 = 0 Solving i2 = 0 Move all terms containing i to the left, all other terms to the right. Simplifying i2 = 0 Take the square root of each side: i = {0}

Subproblem 2

Set the factor '(1 + 4i)' equal to zero and attempt to solve: Simplifying 1 + 4i = 0 Solving 1 + 4i = 0 Move all terms containing i to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 4i = 0 + -1 Combine like terms: 1 + -1 = 0 0 + 4i = 0 + -1 4i = 0 + -1 Combine like terms: 0 + -1 = -1 4i = -1 Divide each side by '4'. i = -0.25 Simplifying i = -0.25

Solution

i = {0, -0.25}

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