Solve the following equation for x. -3x-36=9 (x+8). Simplify the answer as much as possible. Thanks?

2008-02-29 9:42 am

回答 (8)

2008-03-03 6:47 pm
✔ 最佳答案
- 3x - 36 = 9 x + 72
- 108 = 12 x
x = - 9
2008-02-29 9:46 am
-3x-36=9x+72
-12x=108
x=-9
2008-02-29 10:00 am
Let's distribute the 9 on the right hand side of the equation, first:

9(x+8) = 9x + 9x8
= 9x + 72

Now, let's take that expanded form back into the equation, and take a look at it:

-3x - 36 = 9x + 72, is this enough for you?

============================
Don't look any further if you want to attempt it from there, have a go at it :)

I'll go step by step to finish it:

-3x - 36 = 9x + 72, adding 3x to both sides
+3x +3x , and simplify

-36 = 12x + 72, subtracting 72 from both
-72 = -72, and simplify

-108 = 12x, divide both by 12
/(12)= /(12), and simplify

-9 = x, or x = -9, or {-9}

Blessed Be, sorry if the format isn't looking right, when I typed it out, it looked nicer :)
參考: TLSIII
2008-02-29 9:53 am
-3x-36 = 9 (x+8)

-3x-36 = 9x+72
-3x-9x = 72+36
-12x = 108
-x = 108/12
x = -108/12

So x = -9
2008-02-29 9:48 am
-3x-36 = 9 (x+8)
-3x-36 = 9x+72
-3x-9x = 72+36
-12x = 108
-x = 108/12
x = -108/12
x = -9

Therefore, X = -9
2008-02-29 9:49 am
-3x - 36 = 9(x + 8)
-3x - 36 = 9*x + 9*8
-3x - 36 = 9x + 72
-3x - 9x = 36 + 72
-12x = 108
x = 108/-12
x = -9
2008-02-29 9:47 am
-3x-36=9(x+8)
-3x-36+9x+72
-108=12x
-108/12=x
-9=x
2008-02-29 9:46 am
x = - 9


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