I've been doing some Pre-Calc homework and tried doing a certain problem a few times and still can't come up with the right answer. The promblem is 7(3X+6)=11-(X-2). I usually do pretty well with math but I can't figure out what I'm doing wrong with this problem. The first time I did it, I got -2 and the second time, I got -3, but the back of the book says the answer is -2/3. Help, please!
2007-01-21 14:07:26 · 5 answers · asked by Anonymous in Education & Reference ➔ Homework Help
I actually just noticed that I typed this in wrong...the problem is actually 7(3X+6)=11-(X+2). Sorry! Thanks to everyone who is trying to help!
2007-01-21 14:26:08 · update #1
7(3X+6)=11-(X+2).
This distributes to be 21x + 42 = 11 - x - 2
21x + 42 = 9 - x
add x to both sides and subtract 42:
22x = 9 - 42 = -33
divide by 22 and get
x = -33/22 which reduces to -3/2
So the book is wrong.
2007-01-21 14:32:42 · answer #1 · answered by hayharbr 7 · 1⤊ 0⤋
For whatever it's worth, here's what I'm getting:
7(3x+6) = 11 - (x - 2)
21x + 42 = 11 - x + 2
21x + 42 = 13 - x
22x + 42 = 13
22x = 13 - 42
22x = 29
x = 29/22
2007-01-21 22:18:50 · answer #2 · answered by Anonymous · 0⤊ 0⤋
7(3X+6)=11-(X+2).
21x + 42 = 11 - x - 2
21x + 42 = 9 - x
22x = 9 - 42 = -33
x = -33/22 which reduces to -3/2
So the book is wrong.
2007-01-21 22:15:40 · answer #3 · answered by iowa_trooper911 2 · 0⤊ 0⤋
7(3x+6)=11-(x-2)
21x+42=11-x+2
22x+42=11+2
22x+42=13
22x=-29
x=-29/22
??
7(3[-2/3]+6)=11-([-2/3]-2)
7(-2+6)=11-([-2/3]-2)
7(4)=11-(-8/3)
28=11+8/3
THIS IS NOT EQUAL WHEN YOU PLUG IT IN.
Are you sure you copied the problem correctly?
2007-01-21 22:22:52 · answer #4 · answered by Vye 2 · 1⤊ 0⤋
girl, I've worked on this problem for 20 minutes... you dun gone made me think I lost mah mind!
Sorry I can't help! But I'm very curious!
2007-01-21 22:34:49 · answer #5 · answered by Tiff 5 · 0⤊ 0⤋