1. The Imaginary Number System
... form a + bi, where it is a real number plus an imaginary number. This form helps one solve quadratic equations when the solution results in a negative square root. Ultimately, what the quadratic formula (y = -b +/- the square root of b^2 -4ac divided by 2a) tells one is the roots of the equation. The roots are the x-intercepts of the parabola a quadratic equation draws. For example, when ... solving the following quadratic equation, y = x^2 + 4x + 29, using the quadratic formula where a = 1, b = 4, and c = 29, one, comes out with the solution, -2 + 5i. This tells one that the parabola d...
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- Grade Level: High School