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

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


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

Multiply (-2 + 8i) * (2 + i)
(-2(2 + i) + 8i * (2 + i)) = 0
((2 * -2 + i * -2) + 8i * (2 + i)) = 0
((-4 + -2i) + 8i * (2 + i)) = 0
(-4 + -2i + (2 * 8i + i * 8i)) = 0
(-4 + -2i + (16i + 8i2)) = 0

Combine like terms: -2i + 16i = 14i
(-4 + 14i + 8i2) = 0

Solving
-4 + 14i + 8i2 = 0

Solving for variable 'i'.

Factor out the Greatest Common Factor (GCF), '2'.
2(-2 + 7i + 4i2) = 0

Factor a trinomial.
2((-2 + -1i)(1 + -4i)) = 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 '(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 = {-2, 0.25}

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