Folks
Youngest has now started algebra and I was crap at it at school and now 30 years later I forgot what little I learned then
Anyway, we have this (for eg)
4x + 65 = 9x + 10
x =
Could someone please remind me how to do it and the basic principles/rules behind solving.
Ta very much
ATB
Simon
Simplifying
4x + 65 = 9x + 10
Reorder the terms:
65 + 4x = 9x + 10
Reorder the terms:
65 + 4x = 10 + 9x
Solving
65 + 4x = 10 + 9x
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-9x' to each side of the equation.
65 + 4x + -9x = 10 + 9x + -9x
Combine like terms: 4x + -9x = -5x
65 + -5x = 10 + 9x + -9x
Combine like terms: 9x + -9x = 0
65 + -5x = 10 + 0
65 + -5x = 10
Add '-65' to each side of the equation.
65 + -65 + -5x = 10 + -65
Combine like terms: 65 + -65 = 0
0 + -5x = 10 + -65
-5x = 10 + -65
Combine like terms: 10 + -65 = -55
-5x = -55
Divide each side by '-5'.
x = 11
Simplifying
x = 11
4x + 65 = 9x + 10
55 = 5x (9x-4x and 65-10)
X=11 (55/5)
Blimey! Thanks for expansive post
Will get the boy on it (and try to do it meself)
Cheers very much
Simon
Get all the xs on one side, all the numbers the other
I would take 10 from each side (you can do that, but you must do the same both sides)
4x + 65 = 9x + 10
4x + 55 = 9x
Now take 4x from each side
55 = 5x
Now divide by 5
11= x
Afraid this doesn't work well by typing......works better with pencil and paper.
I have to say there are some well F****ng clever barstewards on this site, and some real dense f*ckwits
my answer was Tuesday
perhaps im in the lower portion
Steve
Steve me too.I got Tuesday Afternoon
plus 1.
cannot even find the plus sign on my keyboard.
[Edited on 27/2/14 by ross05]
My head hurts
Letters belong in English, Numbers belong in Mathematics
I like Edmund Blackadder trying to explain maths to Baldrick...
I have two beans, and I add two more. How many do I have? Some beans...
No, what does it make? A very small casserole...
If your son needs extra help then the bbc bitesize website is great.
im studing at OU for a BEng in engineering. Doing a maths module at the moment. I studied Alevel maths and this stuff is still hard going.
Check out the HELM workbooks,
You can download them from here
http://www.personal.soton.ac.uk/jav/soton/HELM/helm_workbooks.html
Hope this helps
If your lad wants to go into engineering then they will give him a very good start.
As said above.
Get all the X terms on one side and all of the constants onto the other. Just remember if you change the side you change the sign.
Tilly
quote:
Originally posted by steve m
I have to say there are some well F****ng clever barstewards on this site, and some real dense f*ckwits
my answer was Tuesday
perhaps im in the lower portion
Steve
Bloody hell, I seem to remember being very good at it when I did the extra maths lesson instead of PE. I loved maths, found it all dead easy and came
away with top honours from the comp and never looked back.. I mean I never looked back at it and never used it..
Now cant even remember how to spell it!