Stage 11 · Quadratic Equations

11.3 The Quadratic Formula and the Discriminant

Push the completing-the-square process through once and for all into a universal formula, and use the expression under the root to judge the roots in advance.

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Knowledge point pages

11.3.1 Where the Quadratic Formula Comes From 11.3.2 Solving by Applying the Formula 11.3.3 The Discriminant Δ=b²−4ac 11.3.4 Using Δ to Judge the Roots 11.3.5 Working Backwards from the Discriminant

eastmath.com · 11.3 The Quadratic Formula and the Discriminant