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Year 9 Interactive Maths - Second Edition


Quadratic Equations

If the highest power of the pronumeral in an equation is two, then it is said to be a quadratic equation.


The Null Factor Law

From this we can infer that:

If the product of any two numbers is zero, then one or both of the numbers is zero.

I.e.  If ab = 0, then a = 0 or b = 0 (which includes the possibility that a = b = 0)

This is called the Null Factor Law; and we use it often to solve quadratic equations. 


Example 1

Solution:




Key Terms

quadratic equation, Null Factor Law, NFL


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