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
More Related Questions
- MS. SUE?? MATH (8TH) CONNECTIONS - I have 3 questions. Multiply the polynomials...
- math - Multiply the following polynomials. 1. -2r(8r+5) A. -16r^2+5 B. -16r^2+10...
- Math help please. - this is for a practice test. i just need the explanation on ...
- Algebra - Can someone help me, I am stuck and do not know how to complete. Maybe...
- 4th grade - 4th grader asks how to solve 8100/?=90
- 4th grade math - How do you solve 41/2-1/4=?
- math - I have been doing pascal triangle and do not know where this question ...
- Math - I am not sure that I answered this question right. A) 3/4 / -12= 3/4 / -...
- 4th grade math - In helping my 4th grade grandson last night with his math, he ...
- 4th grade math - write and solve a mixed number word problem