• Nov 6th 2009, 01:50 AM
learner123
Hey all,

I need help with this equation. It is a hidden equation which I have tried to solve on my maths booklet.

The steps that must be followed are:

ax^2 + bx + c = 0

I have to use the quadratic formula and tranpose the above

here is my question

1 / R + R = 3 + 7 / R

I need to get the A , b , c and plug it in the quadratic formula but the issue is i don't get the right answer which is 4.37, I believe I get the wrong A , B , C values at the start.

If i need to be more specify please tell me.
• Nov 6th 2009, 02:02 AM
Debsta
Take your equation and multiply each side by R to get rid of frcations.
This will give you 1 + R^2 = 3R + 7.
Move everything over to the left to get: R^2 - 3R - 6= 0.
So a=1, b=-3, c=-6.
• Nov 6th 2009, 02:04 AM
learner123
thank you so much it works.
• Nov 6th 2009, 02:24 AM
Debsta
• May 17th 2010, 02:18 AM
mathematicallyretarded
cool
• May 17th 2010, 09:26 AM
Wilmer
Quote:

Originally Posted by learner123
I need to get the A , b , c and plug it in the quadratic formula but the issue is i don't get the right answer which is 4.37,......

4.37 is approximate, plus there is a 2nd solution:
[3 + sqrt(33)] / 2 = 4.37228...
[3 - sqrt(33)] / 2 = -1.37228...
Make sure you get that straight: it'll make your future life easier (Evilgrin)