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# HElp!! Maths question watch

a and b are odd numbers

Give an example to show that the value of 2(a+b) is a multiple of 4.

thnx
2. An odd number is represented by 2n+1 or 2n+3
So substitute those into 2(a+b) and factor out 4.

-edit- Did you mean an example or algebraic proof? Because any example of odd numbers should work.
3. (Original post by alextheowl)
An odd number is represented by 2n+1 or 2n+3
So substitute those into 2(a+b) and factor out 4.

-edit- Did you mean an example or algebraic proof? Because any example of odd numbers should work.
I need an example of an odd number which can be multiplied by two then added by another odd number to make a multiple of 4
4. (Original post by HARRIS786)
I need an example of an odd number which can be multiplied by two then added by another odd number to make a multiple of 4
As I said, you can use any odd numbers. 3 and 5. 11 and 13 - they all work! Maybe you were going wrong with your BIDMAS order? Add inside the brackets first.
5. if you need an example of it working, why not work backwards?

start with a number that is divisible by 4. take away an odd number and divide that result by 2 to get your starting number
6. Use 1 and -1. Any two odd numbers will work since the sum of any odd numbers is even so we have a multiple of 2 multiplied by another multiple of 2 so it's divisible but by 4.
7. (Original post by alextheowl)
As I said, you can use any odd numbers. 3 and 5. 11 and 13 - they all work! Maybe you were going wrong with your BIDMAS order? Add inside the brackets first.
thanks
8. One example is: a=1, b=3.

Therefore 2(a+b) = 2 (1+3) = 2 x 4 = 8.
8 is a multiple of four (2 x 4).

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