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Quadratic Equations
Lesson 2
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Lesson 2: Quadratic Equation Methods

Interpret and solve quadratics with root structure.

Quadratic equations can be solved by factoring or formula. The roots reveal intercepts and shape information for graphs.

Key formula

x=−b±b2−4ac2ax=\frac{-b\pm\sqrt{b^2-4ac}}{2a}

Worked example

3x2−18x+27=0⇒x∈{3,3}3x^2-18x+27=0\Rightarrow x\in\left\{3,3\right\}

Checkpoint

Sum of roots for x2−12x+35=0 is ?\text{Sum of roots for }x^2-12x+35=0\text{ is }?

Recap

  • - Discriminant determines root type.
  • - Factoring is fastest when integer roots exist.
  • - -b/a gives sum of roots quickly.
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