2006-09-24 08:49:14 · 21 answers · asked by mini_dilligaf 1 in Science & Mathematics ➔ Mathematics
2x=3-8(x+2)
2x=3-8x-16
2x=3-16-8x
2x=-13-8x
2x+8x=-13
x(10)=-13
x=-13/10
2006-09-24 08:51:50 · answer #1 · answered by signsden 3 · 2⤊ 0⤋
2x = 3-8(x+2)
2x = 3-8x-16 - multiply out the brackets
2x+8x = 3-16 - move the -8x to the other side of the equation
10x = -13 - add the sides together
10x/10 = -13/10 - divide both sides by 10 to get x on one side
x= -1.3 - Reduce
2006-09-24 09:05:05 · answer #2 · answered by Peakey 3 · 0⤊ 0⤋
2x = 3 - 8(x+2)
first, multiply out the brackets:
2x = 3 - 8x - 16
then collect like terms:
10x = -13
(do you see what I did there? I basically added 8x to both sides, and calculated 3 - 16 = -13)
then divide both sides by 10:
x = -13/10
2006-09-24 08:52:57 · answer #3 · answered by helen g 3 · 1⤊ 0⤋
2x = 3 - 8(x+2)
2x = 3 - 8x -16 (distribute the 8 on the values in the bracket)
2x + 8x = 3 - 16 (add 8x both sides)
10 x = -13 (combine like terms)
x = -13/10 (divide both sides by 10)
x= -1.3 (reduce)
Is that good enough?
2006-09-24 08:52:25 · answer #4 · answered by Vincent G 7 · 2⤊ 0⤋
I think I am correct
2x+3-8(X+2)
3-8=5
X=5
5+2=7
7x2=14
2006-09-24 10:20:16 · answer #5 · answered by Juicy 2 · 0⤊ 0⤋
2x = 3 - 8 (x+2)
2x = 3 - 8x - 16 ---- brackets should be done before subtraction
2x + 8x = 3 - 16
10x = -13
x = -13 / 10
x = -1.3
Note:
- 8 (x + 2) = (-8)(x) + (-8)(2) = -8x - 16
2006-09-24 11:43:47 · answer #6 · answered by Kemmy 6 · 0⤊ 0⤋
2x=3 - 8(x+2) (Distribute negative eight)
2x=3-8x-16 (add 3 and -16)
2x= -13 - 8x (Add -8x to the other side)
10x= -13 (divide both sides by 10)
x= -13/10 (final answer: negative 13 over 10)
2006-09-24 09:01:19 · answer #7 · answered by Anonymous · 1⤊ 0⤋
Order of Operations:
Please - Parentheses
Excuse- Exponents
My- Multiplication (from left to right)
Dear- Division (from left to right)
Aunt- Addition (from left to right)
Sally- Subtraction (from left to right)
2x=3-8(x+2)
2x=3-8x-16 *A negative times a positive is a
negative.
2x + 8x = 3 -16 *Combine like variables. If a number/variable is negative on one side of the equal side, then it is positive on the other.
10 x = -13 *Adding/ subtracting a positive and negative, subtract and keep the sign of the larger number.
x=-13/10= -1.3
2006-09-24 09:50:38 · answer #8 · answered by Go Longhorns! 3 · 0⤊ 0⤋
2x = 3 - 8(x+2)
Expand the brackets:
2x = 3 - 8x -16
Rearrange the terms:
10x = -13
Divide through by 10:
x = -1.3
Check that substituting x = -1.3 gives the same value in both cases ... yes it does, -2.6
QED Bingo tally ho
Byeee
2006-09-24 09:00:01 · answer #9 · answered by Anonymous · 1⤊ 0⤋
2x = 3 - 8 (x+2)
2x = 3 - 8x -16
10x = -13
x = -13/10
2006-09-24 08:52:05 · answer #10 · answered by Anonymous · 1⤊ 0⤋
You need to bring all like terms to the same side of the equation, so:
2x=3-8(x+2)
2x=3-8x+16
2x=19-8x
(add 8x to both sides) 2x+8x=19-8x+8x
10x=19
(now divide through by 10 to get a single x) 10x/10 = 19/10
x=1.9
2006-09-24 08:53:19 · answer #11 · answered by john977 2 · 0⤊ 3⤋