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Simplifying (2 + -7i)(-1 + 4i) = 0 Multiply (2 + -7i) * (-1 + 4i) (2(-1 + 4i) + -7i * (-1 + 4i)) = 0 ((-1 * 2 + 4i * 2) + -7i * (-1 + 4i)) = 0 ((-2 + 8i) + -7i * (-1 + 4i)) = 0 (-2 + 8i + (-1 * -7i + 4i * -7i)) = 0 (-2 + 8i + (7i + -28i2)) = 0 Combine like terms: 8i + 7i = 15i (-2 + 15i + -28i2) = 0 Solving -2 + 15i + -28i2 = 0 Solving for variable 'i'. Factor a trinomial. (-2 + 7i)(1 + -4i) = 0Subproblem 1
Set the factor '(-2 + 7i)' equal to zero and attempt to solve: Simplifying -2 + 7i = 0 Solving -2 + 7i = 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 + 7i = 0 + 2 Combine like terms: -2 + 2 = 0 0 + 7i = 0 + 2 7i = 0 + 2 Combine like terms: 0 + 2 = 2 7i = 2 Divide each side by '7'. i = 0.2857142857 Simplifying i = 0.2857142857Subproblem 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 = 0.25Solution
i = {0.2857142857, 0.25}
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