Chapter 2: Quadratic Functions and Equations
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Topic 2.3
Roots of Quadratic Equations For a quadratic equation ax2 + bx+ c = 0 ■ If b2 -4ac > 0, then there are two real roots
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is called the discriminant Topic 2.4
Graphs of Quadratic Functions For y = ax2 +bx+ c, the graph will cross the y-axis at (O, c)