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1. ### how to solve r ^2+3r=5?

R = 1.1926, -4.1926 Try using MathWay.com Hope this helps!

4 Answers · Science & Mathematics · 07/04/2013

2. ### Prove that r and s must be irrational.?

r = ± 3 - √3, ± 1 - √3 so r IS irrational therefore it must be irrational s = ±√[ r ^2 + (√3) r .... Solve the resulting quartic equation: r ^4 - 4r^2s^2 - 6r^2 + 4s^4 - 12s^2 + 9 = 0 for either " r " or...

1 Answers · Science & Mathematics · 24/01/2010

3. ### 9r = 20 - r , R =?!?!?!?!?!?

Easy! :) Add " r " from the right side to the left, and you will get 10r (pretend there is an... 10r). Then you will get 10r = 20. Divide each side by 10, and r = 2.

7 Answers · Science & Mathematics · 10/10/2011

4. ### Solve for r .................?

Complete the square r ^2 + 3r = 2 ( r + 3/2)^2 - 9/4 = 2 ( r + 3/2)^2 = 2 + 9/4 ( r + 3/2)^2 = 17/4 r + 3/2 = +/- Sqrt 17/4 r = - 3/2 +/- Sqrt 17/4 If you need to go further r = - 3/2 + 2.0615 = 0.5615 r = - 3/2 - 2.0615 = - 3.5615

1 Answers · Science & Mathematics · 16/08/2010

5. ### Find r if 5Pr = 2 6Pr-1?

5Pr = 5!/(5- r )!, and 2(6P( r -1)) = 2*6!/(6- r +1)! so 5!(6- r +1)! = 2*6!(5- r )! 6*5!(7- r )! = 6*2*6!(5- r )! 6!(7- r )! = 12*6!(5- r )! 12 = 6!(7- r )! / 6!(5- r )! 12 = (7- r )(6- r ) so the ...

3 Answers · Science & Mathematics · 13/11/2012

6. ### how do you solve r ^2-4r-5 / 5r-25?

( r ^2 - 4r - 5)/[5( r -5)] = ( r -5)( r +1)/5( r -5) simplify by r -5: ( r +1)/5 that's your result :) if you're not sure how to find roots of r ^2 - 4r - 5, here's how you do it. 1. Find the delta (...

5 Answers · Science & Mathematics · 07/10/2011

7. ### Algebra Help - Find R !!!!?

I = e/ R + r IR = e + rR {multiply both sides by R } IR - rR = e {subtract rR from both sides} (I - r ) R = e {factor left side} R = e/(I - r ) {divide both sidea by (I - r )

4 Answers · Science & Mathematics · 13/10/2007

8. ### need help r -2x = 14 for s?

r - 2s = 14 Solve for s: Subtract r off both sides: -2s = 14 - r Multiply both sides by -1 to avoid trouble later: 2s = r - 14 Divide by 2: s = ( r - 14)/2

5 Answers · Science & Mathematics · 21/09/2012

9. ### Solve for r .......................?

this can be written as r ^2 + 3r - 2 = 0 Now to solve this you can use the discriminat method (delta = b^2...the method of completing the square. r ^2 + 3r + (3/2)^2 - (3.2)^2 -2 =0 ( r + 3/2)^2 = 9/4 + 2 = 17/4 r +3/2 = +or- sqrt(17/4) r = + sqrt(17/4) - 3/2 or...

3 Answers · Science & Mathematics · 15/09/2010

10. ### r =c/2pie help me please !?

r = c / (2π) c = 2 π r c is circumference and r is radius of a circle.

2 Answers · Science & Mathematics · 08/12/2007

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