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How does one use the define f(x) for more than one function?

Chris Kohne
Posted 8 years ago

I'm using Wolfram/Alpha for my son's Algebra 1 lesson on the Language of Functions. His book tells him to:

"1a. Use the DEFINE command to define f(x)=3x^2+2x+10 in your CAS. b. Find f(2). c. Find f(3) + f(-6)"

When I type it in like this: define f(x)=3x^2+2x+10 find f(2). It calculates properly.

How do I get it to "Find f(3) + f(-6)" in one step?

Thank you.
POSTED BY: Chris Kohne
6 Replies
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Chris Kohne
Chris Kohne
Posted 8 years ago

OK, thank you.

POSTED BY: Chris Kohne

Wolfram|Alpha isn't a programming language. There are no commands and the input isn't code.

To get a hang of how to use Wolfram|Alpha, take a look at the example pages, which are very thorough.

http://www.wolframalpha.com/examples/
POSTED BY: Sean Clarke
Chris Kohne
Chris Kohne
Posted 8 years ago

Does WolframAlpha have a tutorial or help section for a high school student to understand better the commands and codes?
POSTED BY: Chris Kohne
Chris Kohne
Chris Kohne
Posted 8 years ago

Thank you both. @ Bianca, I'm sure you are correct.

POSTED BY: Chris Kohne

The reference to "Use the DEFINE command" in the assignment sort of suggests that the authors of the book had a specific computer algebra program in mind... There will be more things you'll have to adjust if you're using a different one like Wolfram|Alpha.
POSTED BY: Bianca Eifert

f(x)=3x^2+2x+10 , find f(2) f(x)=3x^2+2x+10 , find f(3)+f(-6)

both seem to work fine, for example. define is not needed.
POSTED BY: Moderation Team
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