Completing the
Square Method…
plus finding the sum and
product of roots
First of all, for these problems the
Equation must equal 0..
When solving a quadratic equation, (using
Quadratic Formula, Completing the Square,
or Factoring) the equation must equal 0.
 Yes

No,
Need to put this in

form.
Even if you prefer the quadratic
formula…
You
still have to know
the completing the
square method!!
#16 from the January 2011
Algebra 2 Regents Exam:
#36 from the Fall 2009 Algebra
2 Regents
(#’s 36-38 worth 4 points)
#16 from the January 2011 Algebra 2 Regents Exam:
#36 from the Fall 2009 Algebra 2 Regents
If we have time…sum and product
of roots…what does that mean?

Many of you have come across and used
these 2 formulas.
When you solve an equation, you
figure out which value of x makes it
true. This is also called finding the
roots. SO REMEMBER, Solving is
the same as finding roots when
equation is in this form:
From our previous example…
a
c
FOR WORK TIME TODAY:
Revised briefs are due
at end of class today
 If
you have not revised your
brief yet, you have until the
end of this period to finish.
 Use
peer feedback received
Friday to make your brief
great!!!