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by theshadow
Sat Jun 11, 2016 1:37 pm
Forum: Geometry
Topic: Find the values of the opposite sides
Replies: 1
Views: 73

Re: Find the values of the opposite sides

Hello Everyone, I have to solve this quadrilateral problem and no idea where or how to start top left corner is A bottom left corner is B bottom right corner is C top right corner is D Find a way to get the values of CD and DA AB - BC = DA - CD AB - CD = DA - BC AB + DA = BC + CD I'd start by namin...
by theshadow
Fri May 27, 2016 10:47 pm
Forum: Advanced Algebra ("pre-calculus")
Topic: Solve for X (Expressions with Roots)
Replies: 3
Views: 246

Re: Solve for X (Expressions with Roots)

Solve for x: ux^a = x The answer they give is: Step 1: ux^a = x Step 2: x^(a-1) = (1/u) Step 3: x = (1/u)^((1/(a-1)) I understand until that part. The next step, I don't understand. Step 4: x = u^(1/(1-a)) How do you get from Step 3 to Step 4? They used exponent rules and flipping a subtraction. . ...
by theshadow
Thu May 12, 2016 6:00 pm
Forum: Calculus
Topic: How to prove f(x) = (cx-c*x+x-1)/(2x-x-1), where 1<c<2 is decreasing function?
Replies: 3
Views: 80

Re: How to prove f(x) = (cx-c*x+x-1)/(2x-x-1), where 1<c<2 is decreasing function?

How to prove the following function is decreasing function? f(x)\, =\, \dfrac{c^x\, -\, cx\, +\, x\, -\, 1}{2^x\, -\, x\, -\, 1} \mbox{with }\, 1\, <\, c\, <\, 2\, \mbox{ and }\, 0.5\, <\, x\, <\, 1 This one probably works just like the other one, so use the same method. What did they use f...
by theshadow
Thu May 12, 2016 5:46 pm
Forum: Calculus
Topic: How to prove f(x) = [(x-1)*cx-2*x*cx-1+x+1]/(2x-x-1) is increasing function?
Replies: 1
Views: 61

Re: How to prove f(x) = [(x-1)*cx-2*x*cx-1+x+1]/(2x-x-1) is increasing function?

Can you help me improve the following function f(x) is an increasing function? Sure, but we need to see what you've done first. How far did you get, and where are you stuck? . f(x)\, =\, \dfrac{(x\, -\, 1)\, c^x\, -\, 2xc^{x-1}\, +\, x\, +\, 1}{2^x\, -\, x\, -\, 1} \mbox{ with }\, 1...
by theshadow
Thu May 12, 2016 5:39 pm
Forum: Intermediate Algebra
Topic: Doing a comprehensive review, need fraction help...
Replies: 1
Views: 88

Re: Doing a comprehensive review, need fraction help...

The problem is: 2/a 2 - 3/ab + 4/b 2 This is just an expression. Until they give you instructions, there is no problem do resolve. (answer: 2b 2 - 3ab + 4a 2 / a 2 b 2 ) My guess is that they forgot to tell you to "convert to a common denominator and combine". With other fractions that ha...
by theshadow
Fri Apr 01, 2016 3:09 pm
Forum: Advanced Algebra ("pre-calculus")
Topic: solving for x, given exponentials: 4e^2x + 5e^3x = 15
Replies: 7
Views: 480

Re: solving for x, given exponentials: 4e^2x + 5e^3x = 15

denicarl wrote:if I have 4e^2x + 5e^3x = 15
how do I solve for x?

What you wrote means this:

a.

Is that right? Or did you mean this?

b.

denicarl wrote:I tried ln 4 +2x+ln5+3x=ln 15 but that doesn't work.

How did you get to this step?

Thanks.
by theshadow
Fri Apr 01, 2016 3:08 pm
Forum: Advanced Algebra ("pre-calculus")
Topic: solving for x given: 4e^-.2x + 3e^-.3x = 5
Replies: 4
Views: 196

Re: solving for x given: 4e^-.2x + 3e^-.3x = 5

denicarl wrote:how do I solve for x given: 4e^-.2x + 3e^-.3x = 5

The way you've written it means this:

a.

Did you mean this?

b.

Thanks.
by theshadow
Tue Mar 29, 2016 1:03 pm
Forum: Intermediate Algebra
Topic: Question about polynomials.
Replies: 1
Views: 320

Re: Question about polynomials.

squirrel wrote:Hi all,

I have a quick question regarding polynomials. Can I use long division or synthetic division, or both? Thanks in advance. :wave:

Depends on the context, but "both" is probably fine in most cases.
by theshadow
Sat Jan 23, 2016 1:12 pm
Forum: Beginning Algebra
Topic: LCD inquiry
Replies: 3
Views: 606

Re: LCD inquiry

magellan333 wrote:The instructions were to find the LCD of the three. I factored as follows:

X-7 = x-7
3x-21 = 3(x-7)
6x=6x

Therefore my answer was x-7, 3 and 6x.

Okay. Now, after you've read the lesson in the link and factored the 6 in the 6x, what are you getting?
by theshadow
Wed Jan 20, 2016 11:35 pm
Forum: Beginning Algebra
Topic: LCD inquiry
Replies: 3
Views: 606

Re: LCD inquiry

X-7, 3x-21, 6x My answer was 3, x-7, 6x "Your answer" to what? What did the instructions tell you to do? Correct answer per the book is 6x, x-7. If the instructions said to get the factors for the LCD then this answer is right. You can see why here (the last bit of the lesson shows polys;...

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