(4-2i)(5+7i)=0

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Solution for (4-2i)(5+7i)=0 equation:


Simplifying
(4 + -2i)(5 + 7i) = 0

Multiply (4 + -2i) * (5 + 7i)
(4(5 + 7i) + -2i * (5 + 7i)) = 0
((5 * 4 + 7i * 4) + -2i * (5 + 7i)) = 0
((20 + 28i) + -2i * (5 + 7i)) = 0
(20 + 28i + (5 * -2i + 7i * -2i)) = 0
(20 + 28i + (-10i + -14i2)) = 0

Combine like terms: 28i + -10i = 18i
(20 + 18i + -14i2) = 0

Solving
20 + 18i + -14i2 = 0

Solving for variable 'i'.

Factor out the Greatest Common Factor (GCF), '2'.
2(10 + 9i + -7i2) = 0

Factor a trinomial.
2((2 + -1i)(5 + 7i)) = 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 '(5 + 7i)' equal to zero and attempt to solve: Simplifying 5 + 7i = 0 Solving 5 + 7i = 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 + 7i = 0 + -5 Combine like terms: 5 + -5 = 0 0 + 7i = 0 + -5 7i = 0 + -5 Combine like terms: 0 + -5 = -5 7i = -5 Divide each side by '7'. i = -0.7142857143 Simplifying i = -0.7142857143

Solution

i = {2, -0.7142857143}

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