I need help I'm not sure how to solve this inequality..
I r - 8 I = 2
2006-10-24 18:38:49 · 7 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
this " I " is a line not the number 1 sorry about the conffusion
2006-10-24 18:51:38 · update #1
OK, absolute value |r - 8| basically means that if what is contained is negative, make it positive, otherwise leave it alone.
So, we have two ways for |r - 8| to equal 2
One is if r - 8 =2 , which is normal
The other is if r - 8 = -2, because if r- 8 = -2, than |r - 8| would equal 2, which is what you are looking for
So, solve both
r - 8 = 2
r = 10
and
r - 8 = -2
r = 6
Hope I could be of help.
2006-10-24 18:49:48 · answer #1 · answered by Clayton A 2 · 1⤊ 0⤋
just look ... r-8=2 or -(r-8) = 2 solve this and you will find
r=10 or r =6
2006-10-25 02:07:36 · answer #2 · answered by gjmb1960 7 · 1⤊ 0⤋
Case 1
Ir-8I = -(r-8) if (r-8) < 0
=> -r+8 = 2 => r=6
Case 2
Ir-8I = r-8 if (r-8)>0
=> r-8 =2 => r=10
Hence there are two answers => r=10,6
2006-10-25 01:43:36 · answer #3 · answered by Preeti 2 · 2⤊ 0⤋
r-8=2
r=10
or r-8=-2
r=6
2006-10-25 02:38:16 · answer #4 · answered by bubbly 2 · 1⤊ 0⤋
Is it 1r-81=2..........1r= 83.........r=83 or
I r-8 I=2......... r-8 = either 2 or (-2)..........r = 10 or (-6).
Sorry, but I'm kind of confuse by the orignal equation. Hope that my answers can help you.
2006-10-25 01:48:32 · answer #5 · answered by Anonymous · 1⤊ 0⤋
r = 6
you're looking for the absolute value.....so we need the absolute value of -2= 2. so, to get -2 in the left side of the equation, r= 6.
2006-10-25 01:42:25 · answer #6 · answered by Anonymous · 1⤊ 0⤋
world peace my man, world peace
2006-10-25 01:40:09 · answer #7 · answered by spill 2 · 0⤊ 2⤋