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December 8th, 2008, 04:42 AM   #1
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high school algebra

Okay so if I could get help with these problem I would really appreciate it.

x^2+3x -18=0

2x^2[/size] - 11x + 15 =

Solve for all a's and b's. 105a^3b + 27a^2b^2 - 33ab^3

This would really help me. im studing for a math placement test and these are some of the preview questions.
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December 8th, 2008, 01:15 PM   #2
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Re: high school algebra

Review Factoring.
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December 8th, 2008, 08:31 PM   #3
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Re: high school algebra

Good thanks alot. I'll do that.
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December 8th, 2008, 09:33 PM   #4
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Re: high school algebra

X2+3x-18=0
x2+3x=18
x=3,-6


2x2-11x+15=what?
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December 9th, 2008, 08:49 AM   #5
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Re: high school algebra

Quote:
Originally Posted by squerlyq
Good thanks alot. I'll do that.
To clarify: It's not that I won't help. The point I'm making is that I can do it for you. Someone else can do it. But you can't do it until you see why and how it is done by consistent study and example over a period of time, and there is not enough time and space in these forums to do that. If you don't know where to start, and if time is running out, you would be wise to hire a local tutor.
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December 9th, 2008, 08:58 AM   #6
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Re: high school algebra

Reviewing factoring like i was suggested i think i figured this one out.

105a^3 b + 27a^2 b^2 - 33a b^3 = 3(35a^3 b + 9a^2 b^2 - 11a b^3

I'll be so freckin excited if i got this right.
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December 9th, 2008, 01:52 PM   #7
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Re: high school algebra

Quote:
Originally Posted by squerlyq
Reviewing factoring like i was suggested i think i figured this one out.

105a^3 b + 27a^2 b^2 - 33a b^3 = 3(35a^3 b + 9a^2 b^2 - 11a b^3

I'll be so freckin excited if i got this right.
It's "algebra"....

=3ab(35a^2 + 9ab - 11b^2)

The trinomial will not factor further ...but your first two will! As I suggested, don't waste your time here; you need to understand the underlying concepts. Pick up a text and study the explanation and the examples ...and your class notes if not doing this entirely on your own.

Don't worry too much if you find it a bit difficult. Just keep practicing with known examples. I've attached an exercise spreadsheet, OpenOffice [Calc] format. The first sheet is on multiplication of binomials that produce trinomials. The second sheet is the answers to those. OR, use the second sheet as the trinomial factoring exercise and the first to be the answers to those. Press F9 to generate a new set of problems. Entirely free, of course, in every sense of those words.
Attached Files
File Type: zip binomial mult.zip (10.9 KB, 15 views)
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January 5th, 2009, 12:27 PM   #8
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High school algebra

I will write my notes that my teacher has taught me in school this is guide to do algebra on calculator

Variables

Any lowercase letter may be used as a variable.
Exponents

Exponents
are supported on variables using the ^ (caret) symbol. For example, to express x2, enter x^2. Note: exponents must be positive integers, no negatives, decimals, or variables. Exponents may not currently be placed on numbers, brackets, or parentheses.
Parentheses and Brackets

Parentheses ( ) and brackets [ ]
may be used to group terms as in a standard equation or expression.
Multiplication, Addition, and Subtraction

For addition and subtraction, use the standard + and - symbols respectively. For multiplication, use the * symbol. A * symbol is not necessiary when multiplying a number by a variable. For instance: 2 * x can also be entered as 2x. Similarly, 2 * (x + 5) can also be entered as 2(x + 5); 2x * (5) can be entered as 2x(5). The * is also optional when multiplying with parentheses, example: (x + 1)(x - 1).
Order of Operations

Order of Operations

The calculator follows the standard order of operations taught by most algebra books - Parentheses, Exponents, Multiplication and Division, Addition and Subtraction. The only exception is that division is not currently supported; attempts to use the / symbol will result in an error.
Division, Square Root, Radicals, Fractions

The above features are not supported at this time. A future release will add hthis functionality.
Recently I have subscribed to a site and I am getting free tips here is that site http://www.rapidlearningcenter.com
Here is a Math Movie http://www.rapidlearningcenter.com/mathematics
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January 6th, 2009, 09:10 AM   #9
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Quote:
Originally Posted by squerlyq
Solve for all a's and b's. 105a^3b + 27a^2b^2 - 33ab^3
This doesn't make sense. Do you mean "factorize" rather than "solve"? If so, 35a^2 + 9ab - 11b^2 does factorize, but the factors involve irrational values if left in terms of a and b. For particular values of a and b, of course, "factorize" would be interpreted differently; if, for example, a = b = 1, 35a^2 + 9ab - 11b^2 = 35 + 9 - 11 = 33 = 3*11.

I wouldn't recommend using a calculator for simple algebra (except perhaps to provide graphs). If you don't have a suitable textbook, try some of the many websites that provide free information, worked examples, tests and quizzes. Try to understand what is going on overall, rather than just how each individual problem is solved.
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