Ok...can someone show me the steps to solve this. I am having a brain cramp, and keep coming up WRONG.
7(x-y+z) - 3 (-2x-4y+1)
I know I am going to feel lame when I finally get it!!
2007-01-28 03:18:52 · 8 answers · asked by donnam4863 2 in Science & Mathematics ➔ Mathematics
7(x-y+z) - 3 (-2x-4y+1)
7x-7y+7z+6x+12y-3
13x+5y+7z-3
2007-01-28 03:24:13 · answer #1 · answered by 7 · 2⤊ 0⤋
With all due resect to the many answerers. The way they did it is wrong for a beginner. DO ONE STEP AT A TIME.
7(x-y+z) - 3(-2x-4y+1)
1. 7x -7y +7z - 3(-2x-4y+1) expand first parenthesis
2. 7x -7y +7z + 3(2x + 4y -1) put (-1*) inside 2nd parenthesis
3 7x -7y +7z +(6x +12y -3) put 3* inside 2nd () aka (expand it)
4 parenthesis vanish 7x -7y +7z +6x +12y -3
5. group like terms 7x + 6x -7y + 12y +7z - 3
6 do the math 13x +5y +7z-3 (ok I didn't do it one at a time here... but on a sheet of paper I'd be crossing out terms and stuff you cant capture here...)
2007-01-28 11:39:03 · answer #2 · answered by Anonymous · 1⤊ 0⤋
First: eliminate parenthesis > multiply the outer terms with the terms in parenthesis....
7(x) + 7(- y) + 7(z) - 3(-2x) - 3(- 4y) - 3(1)
7x - 7y + 7z - (- 6x) + 12y - 3
7x - 7y + 7z + 6x + 12y - 3
Sec: combine "like" terms...
7x + 6x - 7y + 12y + 7z - 3
= 13x + 5y + 7z - 3
2007-01-28 13:02:06 · answer #3 · answered by ♪♥Annie♥♪ 6 · 0⤊ 0⤋
I m assuming it is a simplification problem
open the brackets and do not forget to change sign
7x-7y+7z+6x+12y-3
= 13x-5y+7z-3
2007-01-28 11:33:35 · answer #4 · answered by prat_apr89 1 · 1⤊ 0⤋
7(x-y+z) - 3 (-2x-4y+1) =
= 7x - 7y + 7z +6x + 12y- 3 =
= 13x + 5y + 7z - 3
this is what I've got
Good Luck !!!!
~ uNtOuChAbLe ~
2007-01-28 11:27:30 · answer #5 · answered by Anonymous · 1⤊ 0⤋
7x - 7y + 7z + 6x + 12 y - 3 =
13x + 5y + 7z - 3
just combine like terms after distributing (distributive property)
2007-01-28 11:25:54 · answer #6 · answered by Malvi 2 · 1⤊ 0⤋
7(x-y+z) - 3 (-2x-4y+1)
7x-7y+7z + 6x +12y -3
13x+5y+7z-3
I think... :/
2007-01-28 11:26:50 · answer #7 · answered by yeraciba 2 · 1⤊ 0⤋
7x -7yPLUS7Z PLUS6X PLUS4Y -3=13X-3YPLUS7Z-3
2007-01-28 11:32:31 · answer #8 · answered by Marie Carmelle G 1 · 1⤊ 1⤋