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Old 09-04-08, 10:09 AM   #1
UnsafeAlpine
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A=1/2h(a+b)

I'd like to take after phantomcow and have Foosters help me solve algebra problems.

solve for a

2A=h(a+b)
2A=ha+hb
2A-hb=ha
(2A-hb)/h = a


did I do it right?
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Old 09-04-08, 10:12 AM   #2
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*enters thread* Nerd Alert!! *runs*
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Old 09-04-08, 10:13 AM   #3
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You are correct.

My first instinct would have been to divide each side by h first, then subtract b from both sides, but it amounts to the same thing.
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Old 09-04-08, 10:14 AM   #4
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Looks like you've got a nice trapezoid on your hands, btw.
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Old 09-04-08, 10:20 AM   #5
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ha! just noticed that...
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Old 09-04-08, 11:06 AM   #6
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Looks like you've got a nice trapezoid on your hands, btw.
Isn't there a law against poaching zoids?
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Old 09-04-08, 11:15 AM   #7
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yes.
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Old 09-04-08, 12:16 PM   #8
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isn't it
(2A/h)-b=a

but then, I haven't taken math in a looong time.
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Old 09-04-08, 12:21 PM   #9
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isn't it
(2A/h)-b=a

but then, I haven't taken math in a looong time.
I thought the same thing, but his answer is actually the same as yours/ours.
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Old 09-04-08, 12:21 PM   #10
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isn't it
(2A/h)-b=a

but then, I haven't taken math in a looong time.

Since b=hb/h it is actually the same thing, just written differently. The earlier answer just writes the whole thing in a single term, all over h.
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Old 09-04-08, 12:24 PM   #11
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oh yeah, I see that now that I opened my eyes :-D
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Old 09-04-08, 01:15 PM   #12
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is this a serious question?
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Old 09-04-08, 05:49 PM   #13
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oh yeah...I started my math class and this is the "refresher" worksheet
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Old 09-04-08, 05:52 PM   #14
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What math class are you taking?

I miss the old days when math classes made sense... back before Abstract Algebra...
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Old 09-04-08, 05:55 PM   #15
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Oh, it's just College Algebra
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Old 09-04-08, 06:15 PM   #16
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That is where it is still fun for me... The advanced stuff is actually still fun, just harder for me to get a good grade, so more stressful.

Good luck!
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Old 09-04-08, 07:46 PM   #17
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College algebra? This is like grade 5 stuff people.
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Old 09-04-08, 10:20 PM   #18
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I miss the old days when math classes made sense... back before Abstract Algebra...
Hey, I liked abstract algebra! I took it as an elective while studying chemistry since my math major roommate assured me that I would like it. And sure enough, it was a really fascinating math class.

As for the OP, I generally wouldn't go undoing factoring when someone has already done the factoring for you. This is why artifice and aprilm naturally end up at their form of the answer. Your answer ultimately is correct, but there's rarely a good reason to go multiplying terms together when they're already factored out for you. Why? Read on...

Multiplying is easy compared to factoring. If you want to multiply later, you can always do so, for no more work than it would be to do so right away. But if you want to factor later, it's generally more work to undo your multiplication than it was to actually do the multiplication. (In this relatively easy case, it's actually the same amount of work. But it's never less work.) So it's better to defer multiplication until you see a clear reason to do so (if this ever becomes the case) than to preemptively multiply stuff together.
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Old 09-05-08, 08:36 AM   #19
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oh yeah...I started my math class and this is the "refresher" worksheet
Got you.. For a second I thought that this was part of college algebra, the main course that is
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Old 09-05-08, 08:42 AM   #20
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Got you.. For a second I thought that this was part of college algebra, the main course that is
"College Algebra" is usually the same thing as high school algebra though. It's rehash of what people have learned, and since forgotten, in high school.

The "Abstract Algebra" mentioned on this thread is an entirely different beast.
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Old 09-05-08, 08:46 AM   #21
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"College Algebra" is usually the same thing as high school algebra though. It's rehash of what people have learned, and since forgotten, in high school.

The "Abstract Algebra" mentioned on this thread is an entirely different beast.
I didnt go to college in the US & A so its lost upon me. But if it is as you say, it makes me slightly worried. Abstract Algebra was kick A
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Old 09-05-08, 09:21 AM   #22
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"College Algebra" is usually the same thing as high school algebra though. It's rehash of what people have learned, and since forgotten, in high school.

The "Abstract Algebra" mentioned on this thread is an entirely different beast.
From what I understand, this is pretty much high school algebra II, with a few thing tacked on. Of course, I never took algebra II. I got as far as algebra I and that was 14 years ago.
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Old 09-05-08, 10:27 AM   #23
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I didnt go to college in the US & A so its lost upon me. But if it is as you say, it makes me slightly worried. Abstract Algebra was kick A
"Abstract algebra" is where you learn about groups, rings, and fields, and such.

I don't like the term, because all algebra is abstract.

But whatev.
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