- Tue Jun 30, 2015 11:55 pm
- Forum: Discrete Math
- Topic: solve this difficult number sequence
- Replies:
**3** - Views:
**73**

Is there a plausible solution for this number sequence? It was posted on another web forum a few years ago by somebody who claimed it came from an IQ test that he couldn't solve. Nobody has posted a reasonable solution. It's bugged me. It does not appear to have any pattern at all even after lookin...

- Fri Jun 19, 2015 5:18 pm
- Forum: Beginning Algebra
- Topic: Can't simplify rational expression
- Replies:
**1** - Views:
**110**

one-and-one-is-three wrote:One from my coursework, tried a few tricks but cannot rumble it,

I wanted to factor the numerator, but thought it was prime?

yes its prime

factor the sum of cubes in the denom to get what cancels: http://www.purplemath.com/modules/specfact2.htm

- Fri Jun 05, 2015 8:22 pm
- Forum: Uncategorized
- Topic: How do you keep notes for math class?
- Replies:
**2** - Views:
**201**

different people do it different ways

but handwriting is best apparently: http://www.scientificamerican.com/artic ... -a-laptop/

(i don't like to, tho!)

but handwriting is best apparently: http://www.scientificamerican.com/artic ... -a-laptop/

(i don't like to, tho!)

- Fri May 22, 2015 1:35 am
- Forum: Intermediate Algebra
- Topic: Substituting a Zero into a negative variable
- Replies:
**8** - Views:
**250**

TepNosreProgger wrote:Is that the lowest your equation will reduce? Can it be divided somehow?

is my reducing legit?

is this from what the other poster did?

if yes, how did "24" turn into "-16"?

if no, where did this come from?

thnx

- Tue May 19, 2015 2:24 pm
- Forum: Advanced Algebra ("pre-calculus")
- Topic: How to linearize this constraint?
- Replies:
**1** - Views:
**124**

I have a MILP model but one of my constraints is nonlinear and I need to convert it to some linear constraints. Assume that the constraint is like this: U-X*F=0 and U,X,and F are variables and I have these variables in other constraints also. I am trying to multiply a great M to some part till conv...

- Wed Apr 29, 2015 11:05 pm
- Forum: Beginning Algebra
- Topic: Please could someone help me to simplify this equation?
- Replies:
**1** - Views:
**236**

we are both uncertain of how to simplify this equation. The equation is 3t(t^2 + t) - t^2 multiply out the parentheses: http://www.purplemath.com/modules/polymult.htm, http://www.purplemath.com/modules/simparen.htm 3t(t^2 + t) = 3t(t^2) + 3t(t) = 3t^3 + 3t^2 then subtract out the other term: http:/...

- Wed Mar 04, 2015 3:47 am
- Forum: Intermediate Algebra
- Topic: help with a few problems
- Replies:
**1** - Views:
**339**

some problems I need due before 12. need help! 1.graph by plotting: -7x+3y=-21 they show how to graph here: http://www.purplemath.com/modules/graphlin.htm 3.find the equation of line through (11,4) perpendicular to y = -8 they explain line eqns here: http://www.purplemath.com/modules/strtlneq.htm 4...

- Thu Feb 19, 2015 9:42 pm
- Forum: Intermediate Algebra
- Topic: Finding the size foundation that takes up all sidings of a tool shed
- Replies:
**1** - Views:
**396**

Shawn is building a tool shed with a square foundation and has enough siding to cover 20 linear feet of walls If he leaves a 4-foot space for a door, then what size foundation would use up all his siding? Not sure how to approach this problem. A formula would also be nice. try using the formulas fo...

- Tue Feb 03, 2015 2:00 pm
- Forum: Trigonometry
- Topic: Trig help! 5cosx - 4sin^2x =2 w/o Pythagorean identities
- Replies:
**1** - Views:
**498**

I was wondering if anyone could help me with an extension trig question that we've been given as homework. We've not been taught Pythagorean identities yet. -360<x<360 5cosx - 4sin^2x =2 R U supposed to solve? if U cant use "cos^2 + sin^2 = 1" then i'm not sure how Ur supposed to do this?...

- Mon Jan 12, 2015 6:24 pm
- Forum: Advanced Algebra ("pre-calculus")
- Topic: Difficult question
- Replies:
**7** - Views:
**1189**

i'm still stuck with the same situation where I have 0=16t^2-144t+180 and I cant get it simplified enough to solve for t. the best I'm able to break it down to is 4t^2-36t+45 which is where I get stuck. put the "=0" back in & solve the quad: http://www.purplemath.com/modules/solvquad....