Intercepts 1: how to find where y = x2 + 3x + 2 crosses?

Quadratic equations and inequalities, variation equations, function notation, systems of equations, etc.
Ms. Bev
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Intercepts 1: how to find where y = x2 + 3x + 2 crosses?

Postby Ms. Bev » Sun Feb 06, 2011 4:59 am

Say we have an equation like y = x2 + 3x + 2. We can graph this just like we'd graph a line. How could you figure out the points where the graph crosses the x-axis?

snowdrifter
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Re: Intercepts 1: how to find where y = x2 + 3x + 2 crosses?

Postby snowdrifter » Sun Feb 06, 2011 4:18 pm

To find out where the graph crosses the x axis you must find those values of x that, when put into the equation, make y equal to zero.
This can be done by factoring the quadratic expression. Learn how here.

SD


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