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Simplifying 10i + -8i2 = 2.5 Solving 10i + -8i2 = 2.5 Solving for variable 'i'. Reorder the terms: -2.5 + 10i + -8i2 = 2.5 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 -2.5 + 10i + -8i2 = 0.0 Begin completing the square. Divide all terms by -8 the coefficient of the squared term: Divide each side by '-8'. 0.3125 + -1.25i + i2 = 0.0 Move the constant term to the right: Add '-0.3125' to each side of the equation. 0.3125 + -1.25i + -0.3125 + i2 = 0.0 + -0.3125 Reorder the terms: 0.3125 + -0.3125 + -1.25i + i2 = 0.0 + -0.3125 Combine like terms: 0.3125 + -0.3125 = 0.0000 0.0000 + -1.25i + i2 = 0.0 + -0.3125 -1.25i + i2 = 0.0 + -0.3125 Combine like terms: 0.0 + -0.3125 = -0.3125 -1.25i + i2 = -0.3125 The i term is -1.25i. Take half its coefficient (-0.625). Square it (0.390625) and add it to both sides. Add '0.390625' to each side of the equation. -1.25i + 0.390625 + i2 = -0.3125 + 0.390625 Reorder the terms: 0.390625 + -1.25i + i2 = -0.3125 + 0.390625 Combine like terms: -0.3125 + 0.390625 = 0.078125 0.390625 + -1.25i + i2 = 0.078125 Factor a perfect square on the left side: (i + -0.625)(i + -0.625) = 0.078125 Calculate the square root of the right side: 0.279508497 Break this problem into two subproblems by setting (i + -0.625) equal to 0.279508497 and -0.279508497.Subproblem 1
i + -0.625 = 0.279508497 Simplifying i + -0.625 = 0.279508497 Reorder the terms: -0.625 + i = 0.279508497 Solving -0.625 + i = 0.279508497 Solving for variable 'i'. Move all terms containing i to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + i = 0.279508497 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + i = 0.279508497 + 0.625 i = 0.279508497 + 0.625 Combine like terms: 0.279508497 + 0.625 = 0.904508497 i = 0.904508497 Simplifying i = 0.904508497Subproblem 2
i + -0.625 = -0.279508497 Simplifying i + -0.625 = -0.279508497 Reorder the terms: -0.625 + i = -0.279508497 Solving -0.625 + i = -0.279508497 Solving for variable 'i'. Move all terms containing i to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + i = -0.279508497 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + i = -0.279508497 + 0.625 i = -0.279508497 + 0.625 Combine like terms: -0.279508497 + 0.625 = 0.345491503 i = 0.345491503 Simplifying i = 0.345491503Solution
The solution to the problem is based on the solutions from the subproblems. i = {0.904508497, 0.345491503}
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