Friday
July 25, 2014

Homework Help: Math check 3

Posted by Shawn on Sunday, October 12, 2008 at 4:41pm.

f(x) = 1/(x+7)+15/(x-8). Find all a for which f(a)=f(a+15).

I understand this so far
f(a)=f(a+15)
1/(7+a) + 15/(a-8) = 1/(a+22) + 15/(a+7)

I have multiplied the LCD of (a-8)(a+7)(a+22)by both sides with no luck.

This is a multiple choice question
a.) -161/8
b.) 120/7
c.) 161/7
d.) -17
I have the answer as


Responses


Math problem still stuck - Ryan, Sunday, October 12, 2008 at 4:05pm
Just plug in the values since it's multiple choice.



Math problem still stuck - Shawn, Sunday, October 12, 2008 at 4:12pm
When I plug in the values what am I looking to find?



Math problem still stuck - bobpursley, Sunday, October 12, 2008 at 4:20pm
If you want to plug in, plug in the answer for a to see if both sides are equal.



Math problem still stuck - Ryan, Sunday, October 12, 2008 at 4:21pm
you want 1/(7+a) + 15/(a-8) = 1/(a+22) + 15/(a+7), your second equation, to be true, so you true the four values of a given in the equation and if both sides are equal, you've found it.



Math problem still stuck - Ryan, Sunday, October 12, 2008 at 4:22pm
*try not true



Math problem still stuck - Shawn, Sunday, October 12, 2008 at 4:32pm
So you are saying that it is none of the multiple choice answers of -161/8,
120/7, 161/7, or -17
?

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Math problem still stuck - Let f(x) = 1/(x+7)+15/(x-8). Find all a for which f(a...
Algebra - Find the LCD for the given rational expressions, and convert each ...
Help1 - WHY rational expressions that are being added must have an LCD, but ...
Math - Please help me I am terrible at math, and this is my last class before ...
Math - I need to find the sum of 1/6 and 1/2. I found the LCD to be 2 so I ...
alebra 1 - y+1/y-1 - y-1/y+1 = 8/3 I know that I have to multiply by the LCD of ...
algebra - How do you find the LCD for these fractions 3/4c & 5/6ct also is the ...
algebra - Reduce to lowest terms 3x-6/x^2-4x+4 perform operation w^2-1/(w-1)2 ...
math check - 23/17 < 5/3 Found LCD 69/51 85/51
math check - 23/17 < 5/3 Found LCD 69/51 85/51

Search
Members