=(3+7i)(8-2i)

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Solution for =(3+7i)(8-2i) equation:


Simplifying
0 = (3 + 7i)(8 + -2i)

Multiply (3 + 7i) * (8 + -2i)
0 = (3(8 + -2i) + 7i * (8 + -2i))
0 = ((8 * 3 + -2i * 3) + 7i * (8 + -2i))
0 = ((24 + -6i) + 7i * (8 + -2i))
0 = (24 + -6i + (8 * 7i + -2i * 7i))
0 = (24 + -6i + (56i + -14i2))

Combine like terms: -6i + 56i = 50i
0 = (24 + 50i + -14i2)

Solving
0 = 24 + 50i + -14i2

Solving for variable 'i'.

Combine like terms: 0 + -24 = -24
-24 + -50i + 14i2 = 24 + 50i + -14i2 + -24 + -50i + 14i2

Reorder the terms:
-24 + -50i + 14i2 = 24 + -24 + 50i + -50i + -14i2 + 14i2

Combine like terms: 24 + -24 = 0
-24 + -50i + 14i2 = 0 + 50i + -50i + -14i2 + 14i2
-24 + -50i + 14i2 = 50i + -50i + -14i2 + 14i2

Combine like terms: 50i + -50i = 0
-24 + -50i + 14i2 = 0 + -14i2 + 14i2
-24 + -50i + 14i2 = -14i2 + 14i2

Combine like terms: -14i2 + 14i2 = 0
-24 + -50i + 14i2 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(-12 + -25i + 7i2) = 0

Factor a trinomial.
2((-3 + -7i)(4 + -1i)) = 0

Ignore the factor 2.

Subproblem 1

Set the factor '(-3 + -7i)' equal to zero and attempt to solve: Simplifying -3 + -7i = 0 Solving -3 + -7i = 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 + -7i = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -7i = 0 + 3 -7i = 0 + 3 Combine like terms: 0 + 3 = 3 -7i = 3 Divide each side by '-7'. i = -0.4285714286 Simplifying i = -0.4285714286

Subproblem 2

Set the factor '(4 + -1i)' equal to zero and attempt to solve: Simplifying 4 + -1i = 0 Solving 4 + -1i = 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 + -1i = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -1i = 0 + -4 -1i = 0 + -4 Combine like terms: 0 + -4 = -4 -1i = -4 Divide each side by '-1'. i = 4 Simplifying i = 4

Solution

i = {-0.4285714286, 4}

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