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September 29th, 2012, 05:54 PM   #1
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Help with Algebra Question

Have a problems with question

Make x the subject:

y=2?(3x^2-1 )

I've tried lots of different ways but I can't quite get the answer. I think I have to get rid of the ? first. That's what I'm not sure about.

Anyway the answer is:

x=?((y^2+ 4)/12 )
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September 29th, 2012, 06:23 PM   #2
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Re: Help with Algebra Question















The above accounts for the possibility of negative x.
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September 29th, 2012, 06:31 PM   #3
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Re: Help with Algebra Question

Hello, walker8476!

Quote:



Take it one step at a time.

Look at what was being done to the x.

(1) x is squared.
(2) Then multiplied by 3.
(3) Then 1 is subtracted.
(4) Then the square root is taken.
(5) Then the result is multiplied by 2.

Now, we read up the list, using the inverse operations.














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September 30th, 2012, 03:09 PM   #4
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Re: Help with Algebra Question

Thank you both. I understand now.

I like the approach of writing out the steps then going up the list. I never knew about this approach. Everything is simple when you break it down!
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