I have tried to solve this equations here is what I did could you please let me know if I have done this correct or where I am going wrong, thanks for any help you can give
2x=3 - 8(x+2) solving gives
2x=3 - 8x - 16 multiplying out brackets,
10x=3 - 16
10x= - 13
x= - 1.3
2007-09-26 09:23:06 · 17 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
2x = 3 -8x - 16
add 10x to both sides - and then deduct the other 2x (lol)
10x = 3 -16
do the addition
10 x = -13
divide by 10
x = -1.3
2007-09-26 09:33:34 · answer #1 · answered by Confucious 1 · 0⤊ 0⤋
2x = 3 -8x - 16
add 10x to both sides
10x = 3 -16
do the addition
10 x = -13
divide by 10
x = -1.3
all your working seems correct
2007-09-26 09:28:33 · answer #2 · answered by Vinni and beer 7 · 0⤊ 1⤋
2x^3 + 17x^2 = - 8x 2x^3 + 17x^2 + 8x = 0 x(2x^2 + 17x + 8) = 0 x(2x + 1)(x + 8) = 0 x = 0 or x = - 1/2 or x = - 8
2016-05-19 02:20:13 · answer #3 · answered by Anonymous · 0⤊ 0⤋
multiply out brackets
2x = 3 - 8x - 16
then gather like terms together
2x + 8x = 3 - 16
10x = -13
therefore
x = -1.3
you got it right - if it doesnt match the answer at the back of the book then perhaps recheck that you have written the questiond own correctly
2007-09-26 14:41:47 · answer #4 · answered by Aslan 6 · 0⤊ 1⤋
now I am baffled - surely you would do the element of '...=3-8...' first, giving you the sum
2x=-5(x+2)
not sure if that would give the same answer in the long run, and bearing in mind I haven't done this sort of thing for over 25 years my brain cells are a little (well ok, a lot) foggy. So please forgive me if I am totally off the mark
2007-09-26 09:35:44 · answer #5 · answered by The one 4 · 0⤊ 1⤋
2x=3 x+2=3 and a half 8x3 and a half is 28
2007-09-26 09:37:41 · answer #6 · answered by Anonymous · 0⤊ 0⤋
It looks ok.
When you're doing equations remember the Mnemonic BODMAS.
Brackets, Of (i.e. times), Divide, Multiply, Add, Subtract.
If you do the actions in this order then you will always work them out right.
2007-09-26 09:34:54 · answer #7 · answered by Anonymous · 0⤊ 0⤋
Yes, it is correct. I substituted the x on the equation and it works, it gives me -2.6 at both side of the equal sign.
2007-09-26 09:36:29 · answer #8 · answered by fed up woman 6 · 0⤊ 0⤋
Answer is spot on.
remember that the procedure is BOMDAS then as a final check substitute the answer into the left hand side and equally substitute the answer into the right hand side. Both answers should agree.
2007-09-27 01:01:21 · answer #9 · answered by Anonymous · 0⤊ 1⤋
2 x = 3 - 8 x - 16
10 x = - 13
x = - 1.3 (agreed!!)
2007-09-26 10:55:04 · answer #10 · answered by Como 7 · 2⤊ 1⤋