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Simplifying (5 + 7i)(2 + -1i) = 0 Multiply (5 + 7i) * (2 + -1i) (5(2 + -1i) + 7i * (2 + -1i)) = 0 ((2 * 5 + -1i * 5) + 7i * (2 + -1i)) = 0 ((10 + -5i) + 7i * (2 + -1i)) = 0 (10 + -5i + (2 * 7i + -1i * 7i)) = 0 (10 + -5i + (14i + -7i2)) = 0 Combine like terms: -5i + 14i = 9i (10 + 9i + -7i2) = 0 Solving 10 + 9i + -7i2 = 0 Solving for variable 'i'. Factor a trinomial. (2 + -1i)(5 + 7i) = 0Subproblem 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 = 2Subproblem 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 = -0.7142857143Solution
i = {2, -0.7142857143}
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