-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)

None

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 (+) = (-)

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[匿名]

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

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Como

2009-08-04 3:42 am

- 15 x - 35 - 4 x + 16 + 11

- 19 x - 8

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[匿名]

2009-08-03 11:19 pm

-19x -7

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[匿名]

2009-08-03 10:44 pm

-15x -35 -4x +16 +11
-19x -8

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[匿名]

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.

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[匿名]

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

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[匿名]

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.

參考: i'm really good at math

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[匿名]

2009-08-03 9:53 pm