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Re: x^2-bx+18=0  TOPIC_SOLVED

Solving for just b , do these first: *Add +bx to both sides, *Multiply both sides by (1/x) That will give you b as a function of x , which seems to be a variable, possibly of two complex numbers. If these values for x are to be in the form, a 1 +a 2 i, then you want a 2 =0, since you specified wanti...
by jg.allinsymbols
on Sat Dec 29, 2012 3:18 am
 
Forum: Intermediate Algebra
Topic: x^2-bx+18=0
Replies: 3
Views: 1965

Re: Difficult problem! please help  TOPIC_SOLVED

More efficient to multiply numerator and denominator by the lowest common denominator, .

The simplification process is a little easier.
by jg.allinsymbols
on Mon Dec 31, 2012 6:06 am
 
Forum: Advanced Algebra ("pre-calculus")
Topic: Difficult problem! please help
Replies: 3
Views: 2073

Re: Trigonometry - Graphing vectors.  TOPIC_SOLVED

You must measure the summand vectors, but you can then measure the resulting vector to check your work.
by jg.allinsymbols
on Thu Jan 03, 2013 2:00 am
 
Forum: Trigonometry
Topic: Trigonometry - Graphing vectors.
Replies: 5
Views: 3207

Re: Trigonometry - Graphing vectors.  TOPIC_SOLVED

spellbinder2050 asks this: Is graphing an accurate depiction of the new magnitude important? If so, I need an explanation of how it is done. My book does not explain how accurate my graph has to be. Yes, graphing a vector, including operations on vectors, is important; at least for the learning proc...
by jg.allinsymbols
on Thu Jan 03, 2013 2:09 am
 
Forum: Trigonometry
Topic: Trigonometry - Graphing vectors.
Replies: 5
Views: 3207

Re: Derivatives ~Chain rule  TOPIC_SOLVED

Could you express the formula for the Chain Rule?

Starting specifically with f(x)=3sin^3(x^2), or 3sin3(x2), you have h(x)=x2, and g(x)=3sin3(x)
You have the composition, g(h(x)). You are interested in the derivative of g(h(x)) with respect to x.
by jg.allinsymbols
on Thu Jan 03, 2013 2:18 am
 
Forum: Calculus
Topic: Derivatives ~Chain rule
Replies: 1
Views: 2475

Re: Is y=(2x+5)(3x-7) considered factored form of a quadrati  TOPIC_SOLVED

It's a function y, of the independent variable, x. The function is in factored form. If you have that y=0,
then the resulting quadratic equation is 0=(2x+5)(3x-7), obviously still in factored form. This may be overly picky.
by jg.allinsymbols
on Fri Jan 04, 2013 4:44 am
 
Forum: Intermediate Algebra
Topic: Is y=(2x+5)(3x-7) considered factored form of a quadratic?
Replies: 1
Views: 1358

Re: Factoring trinomials: 2a^2 + 3a + 1  TOPIC_SOLVED

A somewhat less refined but logical approach is to fill this with possibilities to test:

Code: Select all
(2a + ___)(a + ___)

...but will anything work? Your only choices to make product of 1 are 1 X 1.
by jg.allinsymbols
on Fri Jan 04, 2013 4:54 am
 
Forum: Intermediate Algebra
Topic: Factoring trinomials: 2a^2 + 3a + 1
Replies: 3
Views: 5723

Make some lessons on combinations and permutations

A good set of lessons for combinations and permutations on purplemath site would be great. One of my old Intermediate Algebra books has a couple of sections on these and although good, is not very deep. An old College Algebra book or two here also has some sections on combinations and permutations, ...
by jg.allinsymbols
on Fri Jan 04, 2013 5:59 am
 
Forum: Forum Rules & Guides
Topic: Make some lessons on combinations and permutations
Replies: 0
Views: 5415

Re: Please find the value Y in this given equation?  TOPIC_SOLVED

You can solve for y, but you can't find a value for y. Your equation has two variables, and neither is given a value. Can you solve for y? The WAY to solve it,....Three steps. Focus on "y". The given equation: 2x + [24-2 (y)] = 20 What is the first thing you see that is done to y? What is ...
by jg.allinsymbols
on Sat Jan 05, 2013 9:56 pm
 
Forum: Intermediate Algebra
Topic: Please find the value Y in this given equation?
Replies: 2
Views: 1989

Re: vectors: finding the actual speed and direction of aircr  TOPIC_SOLVED

"Velocity relative to the air," is not too comfortable wording. Maybe this is just difficult to interpret. The way I can make sense of the description and question is, the jet is 500 m/h pointing downward (south), the wind vector80 m/h, is 135 degrees to the left relative to the jet's dire...
by jg.allinsymbols
on Sun Jan 06, 2013 9:23 pm
 
Forum: Trigonometry
Topic: vectors: finding the actual speed and direction of aircraft
Replies: 3
Views: 2640
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