-5(3x + 7) - 4(x - 4) + 11?
2009-08-03 2:46 pm
i know the answer is -19x-8 but i cant seem to show the steps to get to that answer i must be doing something wrong i either end up with 19x-40 or something like that please help
回答 (9)
2009-08-03 2:52 pm
✔ 最佳答案
-5(3x + 7) - 4(x - 4) + 11......Multiply out the parentheses:-15x - 35 - 4x +16 + 11.......Collect the terms
-19x - 8
Remember that (-) x (-) = + and (-) x (+) = (-)
2009-08-03 9:51 pm
-5(3x + 7) - 4(x - 4) + 11
-15x-35-4x+16+11
Rearranging
-15x-4x-35+16+11
-19x-8
-15x-35-4x+16+11
Rearranging
-15x-4x-35+16+11
-19x-8
2009-08-04 3:42 am
- 15 x - 35 - 4 x + 16 + 11
- 19 x - 8
- 19 x - 8
2009-08-03 11:19 pm
-19x -7
2009-08-03 10:44 pm
-15x -35 -4x +16 +11
-19x -8
-19x -8
2009-08-03 9:54 pm
Instead of having the problem this way, look at it like this:
-5(3x+7) + -4(x-4) + 11
This will get you to -15x + 7 - 4x + 16 + 11.
Do the remaining math and you should end up with -19x-8.
-5(3x+7) + -4(x-4) + 11
This will get you to -15x + 7 - 4x + 16 + 11.
Do the remaining math and you should end up with -19x-8.
2009-08-03 9:54 pm
-5(3x+7)= (-5)*3x + (-5)*7= -15x - 35
-4(x-4)= (-4)*x + (-4)*(-4)= -4x +16
+11
Sum it all up and you get
-15x + (-4x) -35 + 16 +11 = -19x -8
-4(x-4)= (-4)*x + (-4)*(-4)= -4x +16
+11
Sum it all up and you get
-15x + (-4x) -35 + 16 +11 = -19x -8
2009-08-03 9:53 pm
okay, so first you distribute
-15x-35 - 4x+ 16+11
then combine like terms
-19x-8 is your answer
hope i helped.
-15x-35 - 4x+ 16+11
then combine like terms
-19x-8 is your answer
hope i helped.
參考: i'm really good at math
2009-08-03 9:53 pm
simplify it more: -15x-35-4x+16+11
combine like terms: -19x-8
combine like terms: -19x-8
收錄日期: 2021-05-01 12:40:36
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090803064637AAh93Jz