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Re: square root of 29,929?  TOPIC_SOLVED

I don't mean to bump an old thread, but I would start off by realizing that the ones digit of the square root has to be 3 since it ends in 9. Look at the following: 0² = 0, 1² = 1, 2² = 4, 3² = 9, 4² = 16 (ends in 6), 5² = 25 (ends in 5), 6² = 36 (ends in 6), 7² = 49 (ends in 9), 8² = 64 (ends in 4)...
by MrAlgebra
on Tue May 24, 2011 7:44 pm
 
Forum: Beginning Algebra
Topic: square root of 29,929?
Replies: 9
Views: 2576

Re: Simplifying Complex Fraction  TOPIC_SOLVED

Question: \frac{5+\frac{x+3}{x-1}}{\frac{3x-1}{1-x^2}} I'm guessing I have to get rid of the fractions by multiplying by the LCD, but I feel like I am missing a step in even getting that. I would be inclined to start like this. Keeping in mind that \frac{\frac{a}{b}}{\frac{c}{d}} = (\frac{a}{b}...
by MrAlgebra
on Wed May 25, 2011 12:17 pm
 
Forum: Intermediate Algebra
Topic: Simplifying Complex Fraction
Replies: 8
Views: 2914

Re: Simplifying expression: x - (x - 1) / [x / (x + 1)]  TOPIC_SOLVED

x - \frac{x-1}{\frac{x}{x+1}} The book gives an answer of \frac{1}{x} . This is probably very simple problem but I really don't understand how to workout a problem like that. I would appreciate if anyone would like to show the steps involved getting to that answer and maybe point to a related lesso...
by MrAlgebra
on Wed Jun 01, 2011 11:37 pm
 
Forum: Intermediate Algebra
Topic: Simplifying expression: x - (x - 1) / [x / (x + 1)]
Replies: 2
Views: 2205

Re: Simplifying Complex Fraction  TOPIC_SOLVED

(\frac{2(3x-1)}{x-1})(\frac{(1-x)(x-1)}{3x-1}) Can I cancel out both (x-1)'s and (3x-1)'s at this point? Would 2(1-x) be the wrong answer? You're right. It should go: (\frac{2(3x-1)}{x-1})(\frac{(1-x)(x-1)}{3x-1}) (...
by MrAlgebra
on Wed Jun 01, 2011 11:41 pm
 
Forum: Intermediate Algebra
Topic: Simplifying Complex Fraction
Replies: 8
Views: 2914

Re: Factor x(2) + 4x - 12, how?  TOPIC_SOLVED

I prefer the "magic number" way of factoring trinomials since the people I've worked with have seemed to understood it better that way. If your trinomial is in the form of ax² + bx + c, then you find two numbers that multiply to give you the product ac and that add to give you b. With your...
by MrAlgebra
on Fri Sep 14, 2012 8:36 pm
 
Forum: Beginning Algebra
Topic: Factor x(2) + 4x - 12, how?
Replies: 7
Views: 4607

Re: How to solve order of operations w/missing number  TOPIC_SOLVED

With 76-?/2=41, you would write the equation out as 76 - x/2 = 41 and solve for x. Note that there are no parentheses around the 76 - x part, so the first thing you would be doing in the problem is dividing x by 2. I would start out by subtracting 76 from both sides: 76 - x/2 = 41 76 - x/2 - 76 = 41...
by MrAlgebra
on Sat Sep 15, 2012 4:12 pm
 
Forum: Pre-Algebra
Topic: How to solve order of operations w/missing number
Replies: 3
Views: 3311

Re: can't remember how to solve (x+5)-2(4x-1)=0  TOPIC_SOLVED

Start off by simplifying everything that you can. Maybe try multiplying out the -2(4x-1) part? :) (x + 5) - 2(4x - 1) = 0 x + 5 - 8x + 2 = 0 Don't forget that you have to multiply out by -2 instead of just 2, so you'll get -8x + 2 instead of 8x - 2. From there, you can simplify some more and try to ...
by MrAlgebra
on Sun Sep 16, 2012 4:07 am
 
Forum: Pre-Algebra
Topic: can't remember how to solve (x+5)-2(4x-1)=0
Replies: 2
Views: 2955

Re: Factor x(2) + 4x - 12, how?  TOPIC_SOLVED

It's not as difficult as it might sound to list out all of the possible factors to see what they add up to. Suppose we have: 8x² + 24x + 10 So you're looking for two numbers that will multiply to give you 80 and that add to give you 24. Let's look at the factors of 80 by just starting at 1 and seein...
by MrAlgebra
on Sun Sep 16, 2012 2:42 pm
 
Forum: Beginning Algebra
Topic: Factor x(2) + 4x - 12, how?
Replies: 7
Views: 4607

Re: Need help solving 9x^3 - 42x^2 - 24x  TOPIC_SOLVED

When factoring 3x² - 14x + 8, you'll need to find two numbers that multiply to give you ac while adding to give you b. In this case, ac = 3(8) = 24 and b = -14. We'll want to look at negative factors of 24 since we need them to add up to a negative number: -1 -24, sum = -25 so that's not it -2 -12, ...
by MrAlgebra
on Sun Sep 16, 2012 2:49 pm
 
Forum: Pre-Algebra
Topic: Need help solving 9x^3 - 42x^2 - 24x
Replies: 6
Views: 3910

Re: in 2008, 565650 Americans died of (all form of) cancer.  TOPIC_SOLVED

This is really just a ratio question.

"in 2008, 565650 Americans died of (all form of) cancer. Assuming a population of 305 millions, what was the mortality rate in units of deaths per 100000 people?"

You could set this up as 565650/305000000 = x / 100000 and go from there.
by MrAlgebra
on Mon Sep 17, 2012 2:21 pm
 
Forum: Beginning Algebra
Topic: in 2008, 565650 Americans died of (all form of) cancer.
Replies: 2
Views: 1609
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