- Tue Nov 03, 2015 1:26 pm
- Forum: Uncategorized
- Topic: 7,7,7,7
- Replies:
**4** - Views:
**95**

Wow. I never would have found either of these. Do you play with these a lot? Maybe they've be good exercise for me.

- Tue Nov 03, 2015 12:13 am
- Forum: Intermediate Algebra
- Topic: Writing rational expression in lowest term; help
- Replies:
**3** - Views:
**150**

\dfrac{a^3\, +\, b^3}{a\, +\, b} Answer is supposed to be a^2\, -\, ab\, +\, b^2 Can anyone explain how to solve this? They're expecting you to remember the special-factoring formula for the sum or difference of cubes. You can find those here . If you apply the sum-of-cubes formula to the top, then...

- Wed Oct 07, 2015 4:26 pm
- Forum: Beginning Algebra
- Topic: Discrete-Time Function
- Replies:
**4** - Views:
**228**

I can write x(n) = u(n) - u(n-4), where u(n) is the unit step function. This this right? n = -5: u(-5) - u(-5 - 4) = u(-5) - u(-9) = 0 - 0 = 0 thru: n = -1: u(-1) - u(-1 - 4) = u(-1) - u(-5) = 0 - 0 = 0 These are right, but: n = 0: u(0) - u(0 - 4) = u(0) - u(-4) = 1/2 - 0 = 1/2 n = 1: u(1) - u(1 - ...

- Tue Sep 29, 2015 1:26 pm
- Forum: Uncategorized
- Topic: Question
- Replies:
**4** - Views:
**156**

Alfred wrote:What does this mean: >i

It probably depends on the context. Where did you see this?

- Mon Sep 14, 2015 11:11 am
- Forum: Intermediate Algebra
- Topic: Linear Programming quiz questions
- Replies:
**2** - Views:
**256**

E. What is the maximum number of extreme points of a feasible region with only one constraint excluding the nonnegativity constraint? My solution: I said that the maximum number of extreme points will not exist because if there is no nonnegativity constraint there is no x and y axes. When they say ...

- Thu Aug 06, 2015 3:51 pm
- Forum: Uncategorized
- Topic: making cubes
- Replies:
**7** - Views:
**459**

Added information: If a cube can be obtained by rotating another cube, these two cubes are NOT considered to be different. So the other reply was right about what to assume. Thanks for that. My 27 is wrong. How do you know? What was your reasoning? My reasoning would start by doing one half (or &qu...

- Sun Jul 05, 2015 5:10 pm
- Forum: Trigonometry
- Topic: Trigonometry functions help
- Replies:
**1** - Views:
**233**

Hey guys... i need help with the following functions.. Do you maybe mean "with solving the following equation over the following interval"? 3 tan 2x + sin 2x = 0 between 0 and 180 What I got is: sin 2x (3 - cos 2x) = 0 How did you get this? It doesn't have the same solution or graph: http...

- Mon May 25, 2015 4:52 pm
- Forum: Calculus
- Topic: Differatiation: normal to y=2x/(x^2+1) at a point (3;0,6)
- Replies:
**1** - Views:
**519**

find the equation of the normal line to the curve y=2x/(x^2+1) at a point (3;0,6) and also that of the tangent. Calculus: What did you get for the derivative of y? Algebra: What did you get when you plugged x = 3 into the derivative? So what is the slope at x = 3? Using this slope and the point the...

- Fri May 22, 2015 10:55 am
- Forum: Intermediate Algebra
- Topic: Substituting a Zero into a negative variable
- Replies:
**8** - Views:
**691**

TepNosreProgger wrote:its not from thier post,

after referencing nona.m.nona 's post i plugged in the equation i'm trying to solveTepNosreProgger wrote:so i'm trying to substitute this (1x^2 + 0x + 1 = 0) into the quadratic formula

How did you get b^2 - 4ac = -16 from a = 1, b = 0, and c = 1?

- Sat May 02, 2015 8:26 pm
- Forum: Advanced Algebra ("pre-calculus")
- Topic: Complex Numbers Exponential Form
- Replies:
**1** - Views:
**540**

Coverct to rectanguala a+bi z = e^(3-i pi/2) Exponential form (starting about 2/3 of the way down here ) looks like: . . . z\, =\, r\, e^{i\theta} Use rules of exponents to convert your right-hand side expression into the normal format: . . . e^{3\, -\, \frac{i\,\pi}{2}} \, =\, e^3\, e^{-\frac{i\,\...