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Exercise: Week 8 Concept Check
Due Day 5 (Friday)
Post
in the
Assignment Section
a response to the following: If you are
looking at a graph of a quadratic equation, how do you determine where the
solutions are?
any point on the graph is a solution of the equation of that graph.
example:
if your equation is y = x^2 + + x + 1, then when you look at the graph and see a point on the graph, you
plot what the x value of that point is and the y value of that point is and you have a solution of the graph.

if it is a quadratic equation, where the graph crosses the x axis tells you what the roots are of the equation.
these are called the x intercepts.
if the graph doesn't cross the xaxis then it doesn't have any real roots.
since a quadratic is in the form of ax^2 + bx + c,
then a, b, and c tell you a few things about the graph also.
b/2a is the x value of the minimum / maximum point on the graph.
if the graph is pointing upwards, then b/2a is the x value of a maximum point.
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 Winter '11
 STEVEJOSEPH

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