Maths Homework - Help me impress daughter

Hi there money pit,

The trick here is to get the solveable variable on one side of the = sign and then solve. When you swap values either side of = you need to swap +ve and -ve. When you have a value outside of brackets i.e. 2(x+4) then that is short way of stating 2x+8.

Examples from above
1) 3a-5=a+7; 3a-a=7+5; 2a=12; a=12/6=6
2) 4x-3=7-x; 4x+x=7+3; 5x=10; x=10/5=2
3) 2(4x-7)=5(2x+3); 8x-14=10x+15; 8x-10x=15+14; -2x=29; x=-(29/2)=-14.5

I hope this helps with the homework.

Regards,
Hugh

Well u have to know algerbra. Ther r rules but hard to apply single formula. Here we go 4 the ones u have put up.

3a-5=a+7

Well u can shift each item each side but they change sign from + t0 _ or vice versa when u do that so

3a-a=7+5
2a=12
a=6

and
4x-3=7-x
4x+x=7+3
5x=10
x=2

and
10x+1=25-2x
10x+2x=25-1
12x=24
x=2

and
2(4x-7)=5(2x+3)
multiply out brackets
8x-14=10x+15
8x-10x=15+14
-2x=29
x=-14.5

and i'm 60 and never thouight i'd need to remember this sh*t again!!!!

What you do to one side of the"=" sign you have to do to the other.

3a-5=a+7
3a-5-a=7
3a-a=7+5
2a=12
a=6

4x-3=7-x
4x+x-3=7
5x=7+3
5x=10
x=2

10x+1=25-2x
10x=25-1-2x
10x+2x=24
12x=24
x=2

2(4x-7)=5(2x+3)
8x-14=10x+15
8x-10x=15+14
-2x=29
x=-14.5

(unless I have had too many reds....which is quite possible!)

Trevor

3a - 5 = a +7
(1) transpose all the "a's" onto the same side, remember when moving from one side to the other the sign must change, so the "a" on the right hand side becomes "-a" when moved to the left hand side
this gives us "3a - 5 - a = 7"
(2) transpose all the numbers onto the same side. Remember the change sign rule - by moving "- 5" from the left hand side it becomes "+5" on the right hand side
this gives us "3a - a = 7 +5"
(3) add up each side individually
(3a - a) becomes 2a, (7 + 5) becomes 12
so, this gives us "2a = 12"
(4) divide both sides by "2"
result is " a = 6"

"4x - 3 = 7 - x" and "10x + 1 = 25 - 2x " - use same method

2(4x - 7) = 5(2x + 3)
(1) multiply everything inside the brackets by everything outside the brackets to get, on left hand side you will have "8x -14", on right hand side "10x +15"
or "8x - 14 = 10x +15
(2) then follow above procedure
8x - 14 = 10x +15
8x - 14 - 10x = 15
8x - 10x = 15 +14
-2x = 29
-x = 14.5
x = -14.5

Jeff

NO NO NO. your ALL wrong.

The answer is 27 !

te he

I'm sure, if I remember correctly, that the ANSWER is in fact 42 !!
What was the question again? :)

People,

Thank you all. I have retained some dignity in the eyes of my 13 year old.

Dave

Bloody Einstein’s

Algebra help

Put in the equation you need, it not only gives the answer but the breakdown of how to get the answer I used this when I had to help my teenager.

Sandy

And remember that you must sequence your actions in the order of BOMDAS

brackets
of
multiply
divide
add
subtract

I am having a nurvous break down just looking at this maths again!!!

I did not realise the readers of this forum were so smart!!

I know you need a brain to drive a four wheel drive - oh I get it - the smart people are Patrol owners!!!!!

Thanks for reminding me how much I hated maths in school... I still can't figure out why we learn algebra... Don't know a single person who applies it in real life.

Moneypit Don't worry about impressing your daughter, These blokes have impressed me no end.
I had forgotten more of this stuff than I ever could remember (does that make sense?)

As Blue said "You never use the stuff in the real world"