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1. ### 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

2. ### how do you show that the divergence of a unit vector r(hat) = 2/|r|?

Let r = (x(1), x(2), ..., x(n)). So, |r...x(2))^2 + ... + (x(n))^2]. Hence, r(hat) = (x(1)/√[(x(1))^2 + (x(2))^2...x(1))^2 + ... + (x(n))^2)^(-1/2) = (n-1)/|r|. In the case where n = 3, this ...

1 Answers · Science & Mathematics · 14/03/2013

3. ### What does R mean in statistics?

The correlation coefficient, r, is a measure of the linear relationship between two variables. If...the data tends to have a negative slope. Positive values for r indicate the data tends to have a positive slope. if r = 0 we say the ...

7 Answers · Science & Mathematics · 03/01/2008

4. ### Solve for r r/5+6/5=r/7=8/7?

r/5 + 6/5 = r/7 + 8/7 7r + 42 = 5r + 40 2r = - 2 r = - 1 Answer: r = - 1 Checking: - 1/5 + 6/5 = - 1/7 + 8/7 5/5 = 7/7 1 = 1

2 Answers · Science & Mathematics · 17/11/2010

5. ### Use the quadratic formula to solve the following equation. (r-3)(r+9)=-9?

(r − 3)(r + 9)=-9 => r(r + 9) −3(r + 9)= -9 => r^2 + 9r −3r − 27 = -9 => r^2 + 6r − 18 = 0 now...

4 Answers · Science & Mathematics · 15/12/2013

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. ### Switch to rectangular coordinates please! r=5sin(theta)?

y = r*sin(T) We know that r = 5*sin(T) which gives sin(T) = r/5 And r^2 = x^2...

3 Answers · Science & Mathematics · 03/05/2010

8. ### 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

9. ### 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

10. ### How do you solve this for r....?

✰Answer✰ r = (-3y - 2k)/(a - 1) ✐Derivation✐ 2k + ar = r - 3y Try different... is the better way to solve for r. ar = r - 3y - 2k ar - r = -3y - 2k Factor the left side. r(a - 1) = -3y - 2k r = (-3y - 2k)/(a...

3 Answers · Science & Mathematics · 27/07/2012