This week's tip of the week is online graphing calculators, such as:
I use this all the time either to check my work, answer keys, or students work. Most of the time math such as algebra, geometry, algebra II, pre-calculus, and calculus all have different subjects that you need to graph such as the classic y=mx+b, quadratic equations (parabolas), or trig functions (i.e. y=sin(x), y=2cos(x), ...) it's nice to see what the graph looks like. It's also nice that once you have it on the screen you can take a screen shot and send it out to students to see what the numbers really mean. So the next time you have a problem that needs intersections, maximums, minimums, or roots look for a graphical picture. It may not give you the correct answer but it will show you were you need to be looking for that answer.
The following image was created using word and the HRW-online calculator.
The above graph is for f(x)=3x2 +2x-5.
Happy Surfing
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