Posted by **Dan** on Thursday, March 25, 2010 at 10:38pm.

R^2 + R^2 + 16R + 64 = 144

solve for R.

- 4th grade math -
**drwls**, Friday, March 26, 2010 at 8:24am
Gee, I didn't learn any algebra until the ninth grade. What you have can be reduced to something called the quadratic equation.

2R^2 + 16R -80 = 0

R^2 +8R -40 = 0

R = (1/2)[-8 +/-sqrt224]

= 3.4833 or -11.4833

There are no integer solutions.

Are you sure you didn't mean to write

R^2 + 16R + 64 = 144 ?

That has a simpler solution that you can get by taking the square root of each side.

(R + 8)^2 = 12^2

R = -8 +or- 12 = -20 or +4

## Answer This Question

## Related Questions

- MS. SUE?? MATH (8TH) CONNECTIONS - I have 3 questions. Multiply the polynomials...
- MATH HELP PLEASE - 1. x^9/x^2 a.x^11 b.x^7*** c.7 d.x^5 2.h^14/h^5 a.h^-9*** b.1...
- math - Multiply the following polynomials. 1. -2r(8r+5) A. -16r^2+5 B. -16r^2+10...
- Math "Need Help Asap"! - 6.)-2r(8r+5) A.)-16r^2+5) B.)-16r^2+10 C.)-16r^2-10r D...
- math hurry - 1. x^9/x^2 a.x^11 b.x^7 c.7 d.x^5 2. h^14/h^5 a.h^-9 b.1/h^9 c.h^19...
- Math help please. - this is for a practice test. i just need the explanation on ...
- math - 1. x^9/x^2 a.x^11 b.x^7 c.7 d.x^5 2. h^14/h^5 a.h^-9 b.1/h^9 c.h^19 d.h^9...
- Math help! - 5. Replace the ___ with <, >, or = to make a true statement. ...
- 4th grade - 4th grader asks how to solve 8100/?=90
- Algebra - Can someone help me, I am stuck and do not know how to complete. Maybe...

More Related Questions