How would I find the quadratic equation given the solutions of ± i? Start with the solution and work backwards: x = ±i x = ±√1 {the square root of 1 is i, when dealing with "imaginary" or "complex" numbers} x² = 1 {squared both sides of the previous equation} x² + 1 = 0 {added 1 to both sides} © Algebra House
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