Question

Sum and difference of 2 numbers

Answer 1

Answer:

When you have a sum and a difference and add them together, that is the same as doubling one of them. For example, if the two numbers are 7 and 4, then the sum is 11 and the difference is 3. ... Adding the sum to the difference is (a+b) + (a-b) which is a + b + a - b = 2a.

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