# how to graph??

• May 19th 2005, 08:32 AM
wynd90
how to graph??
hey, i was just wondering how I would graph these equations step by step. I have a quiz on them tomorrow and I can't figure them out.

1) y = x(squared)(multiplied by)e(to the x)

2) y = (lnx)(squared)

thanks for your help
• May 19th 2005, 09:43 AM
MathMan
Here are the above questions using Latex:

1. $y=x^2e^x$

2. $y= \ln{x^2}$
• May 19th 2005, 08:33 PM
paultwang
Quote:

Originally Posted by wynd90
hey, i was just wondering how I would graph these equations step by step. I have a quiz on them tomorrow and I can't figure them out.

What do you have to work with? For example, a calculator, a log table, etc.
• May 25th 2005, 11:18 AM
wynd90
nothing to use
hey, i have nothing to use except a scientific calculator and a piece of paper
• May 25th 2005, 12:50 PM
paultwang
Great, you have a calculator.

MathMan, I think
Quote:

y = (lnx)(squared)
means $y=(ln \, x)^2$

You need x-intercept, y-intercept, extrema (you might not get all three because some functions do not have some), and a few points. You must know the domain (x-range) so you know what to plot. Ask, or determine yourself.

1. Find those by hand or by a calculator... just plug x into the function. A calculator produces a much better estimate for the points.
2. Plot them.
3. Connect the dots as smoothly as possible.