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Wed Nov 02, 2016 5:47 pm
Forum: Discrete Math
Topic: Issue with some question for assignment: Pigeonhole Principle, equiv. relation, recurrance relation, etc
Replies: 2
Views: 1821

### Re: Issue with some question for assignment: Pigeonhole Principle, equiv. relation, recurrance relation, etc

Hi i have few questions over here and need some expert/pro view with approaching the question. The proving one would be an issue to me as well. Hope people would be able to assist me here , because i am basically struggling with it :( thanks http://i.imgur.com/IlpU8pE.png http://i.imgur.com/7IctVlN...
Mon Sep 12, 2016 4:48 pm
Forum: Beginning Algebra
Topic: Solving One Step Equations: (-3/5)a = 27
Replies: 2
Views: 1062

### Re: Solving One Step Equations: (-3/5)a = 27

The first problem that we need help with is: \dfrac{-3}{5}\, a\, =\, 27 In the second step, they are multiplying both sides by 5 which we understand, but how are they getting -3a as the answer on the left after multiplying by 5? \begin{align} \dfrac{-3}{5}\, a\, &=\, 27 \\ (5)\, \dfrac{-3}{5}\, a\,...
Mon Sep 05, 2016 3:07 pm
Forum: Advanced Algebra ("pre-calculus")
Topic: Solve using induction n! < ((n+1)/2)^n
Replies: 1
Views: 805

### Re: Solve using induction n! < ((n+1)/2)^n

n! < ((n+1)/2)^n if n>2
Your subject line says that you need to "solve using induction", but induction is a form of proof, not of solution. You can learn about what induction is, and how to apply it, in this lesson.

Where are you stuck in the process? Please show ALL of your work so far. Thanks.
Wed Jul 06, 2016 5:08 pm
Forum: Beginning Algebra
Topic: Order of operations isn't working.
Replies: 3
Views: 1159

### Re: Order of operations isn't working.

Q = 1,500 – 4P + 5A + 10I + 3PX P = $400 A =$20,000 I = $15,000 PX =$500 pemdas Q = 1500 – 4 * 400 + 5 * 20000 + 10 * 15000 + 3 * 500 Q = 1500 – (4*400) + (5*20000) + (10*15000) + (3*500) Q = 1500 – 1600 + 100000 + 150000 + 1500 Q = 1500 – 253100... Without any grouping symbols telling you to, wh...
Sat Jun 11, 2016 1:37 pm
Forum: Geometry
Topic: Find the values of the opposite sides
Replies: 1
Views: 1107

### 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...
Fri May 27, 2016 10:47 pm
Forum: Advanced Algebra ("pre-calculus")
Topic: Solve for X (Expressions with Roots)
Replies: 3
Views: 1267

### 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. . ...
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: 969

### 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 for simil...
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: 776

### 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\, <\, c\, <\, 2...
Thu May 12, 2016 5:39 pm
Forum: Intermediate Algebra
Topic: Doing a comprehensive review, need fraction help...
Replies: 1
Views: 701

### 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 have non-mat...
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: 1790

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

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

a. $4e^2x + 5e^3 x = 15$

Is that right? Or did you mean this?

b. $4e^{2x} + 5e^{3x} = 15$
I tried ln 4 +2x+ln5+3x=ln 15 but that doesn't work.
How did you get to this step?

Thanks.

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