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Simplifying (-2 + 4i)(7 + 2i) = 0 Multiply (-2 + 4i) * (7 + 2i) (-2(7 + 2i) + 4i * (7 + 2i)) = 0 ((7 * -2 + 2i * -2) + 4i * (7 + 2i)) = 0 ((-14 + -4i) + 4i * (7 + 2i)) = 0 (-14 + -4i + (7 * 4i + 2i * 4i)) = 0 (-14 + -4i + (28i + 8i2)) = 0 Combine like terms: -4i + 28i = 24i (-14 + 24i + 8i2) = 0 Solving -14 + 24i + 8i2 = 0 Solving for variable 'i'. Factor out the Greatest Common Factor (GCF), '2'. 2(-7 + 12i + 4i2) = 0 Factor a trinomial. 2((-7 + -2i)(1 + -2i)) = 0 Ignore the factor 2.Subproblem 1
Set the factor '(-7 + -2i)' equal to zero and attempt to solve: Simplifying -7 + -2i = 0 Solving -7 + -2i = 0 Move all terms containing i to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + -2i = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -2i = 0 + 7 -2i = 0 + 7 Combine like terms: 0 + 7 = 7 -2i = 7 Divide each side by '-2'. i = -3.5 Simplifying i = -3.5Subproblem 2
Set the factor '(1 + -2i)' equal to zero and attempt to solve: Simplifying 1 + -2i = 0 Solving 1 + -2i = 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 + -2i = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -2i = 0 + -1 -2i = 0 + -1 Combine like terms: 0 + -1 = -1 -2i = -1 Divide each side by '-2'. i = 0.5 Simplifying i = 0.5Solution
i = {-3.5, 0.5}
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