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Re: Ranks?

Any reasons why this forum is so inactive?

I joined yesterday, and there's been no posts since.
And most "last posts" in categories are earlier than 2014.

Kind of disappointing, given all the wonderful lessons available here...
by Alfred
on Sat Mar 15, 2014 4:50 pm
 
Forum: News
Topic: Ranks?
Replies: 3
Views: 13674

Parabola equation  TOPIC_SOLVED

GIVEN:
coordinates of vertex: (u,v)
coordinates of a point on parabola: (d,e)

Find equation of parabola

I got:
y = [(e - v) / (d^2 + u^2 - 2du)]x^2 - (2au)x + au^2 + v

Can someone confirm? Thank you.
by Alfred
on Sun Mar 16, 2014 4:53 am
 
Forum: Geometry
Topic: Parabola equation
Replies: 2
Views: 1134

Re: Parabola equation  TOPIC_SOLVED

I didn't times it all out, but I got y = [(e-v)/(d-u)^2](x-u)^2 + v I think mine probably ends up like yours if you do all the steps. (Do you have to do all that?) Ok, but a parabola equation is of this format: y = Ax2 + Bx + C I really should have made mine clearer: y = Ax^2 + Bx + C where: A = (e...
by Alfred
on Sun Mar 16, 2014 7:31 pm
 
Forum: Geometry
Topic: Parabola equation
Replies: 2
Views: 1134

Re: Logarithm equation

JC531 wrote:log5(x-1)

Did you know that equals log(x-1) / log(5) ?
by Alfred
on Mon Mar 17, 2014 5:27 am
 
Forum: Advanced Algebra ("pre-calculus")
Topic: Logarithm equation
Replies: 5
Views: 876

Re: Arch Problem

No graph paper?
by Alfred
on Tue Mar 25, 2014 10:52 am
 
Forum: Intermediate Algebra
Topic: Arch Problem
Replies: 2
Views: 607

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