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Unformatted text preview: s a solution technique. The
problem is, of course, that it is sometimes not easy to do the factoring.
Square Root Property
The second method of solving quadratics we’ll be looking at uses the square root property, If p 2 = d then p = ± d
There is a (potentially) new symbol here that we should define first in case you haven’t seen it
yet. The symbol “ ± ” is read as : “plus or minus” and that is exactly what it tells us. This symbol
is shorthand that tells us that we really have two numbers here. One is p = d and the other is p = - d . Get used to this notation as it will be used frequently in the next couple of sections as
we discuss the remaining solution techniques. It will also arise in other sections of this chapter
and even in other chapters.
This is a fairly simple property to use, however it can only be used on a small portion of the
equations that we’re ever likely to encounter. Let’s see some examples of this property. Example 4 Solve each of the following equations.
(a) x 2 - 100 = 0 [Solution]
(b) 25 y 2 - 3 = 0 [Solution]...
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This note was uploaded on 06/06/2012 for the course ICT 4 taught by Professor Mrvinh during the Spring '12 term at Hanoi University of Technology.
- Spring '12