Answer:
[tex]2(a+b)[/tex].
Step-by-step explanation:
We re asked to write an algebraic expression for the given word phrase.
The sum of 'a' and 'b' would be 'a' added to 'b' as: [tex]a+b[/tex].
2 times the sum of 'a' and 'b' would be 2 multiplied to the sum of 'a' and 'b': [tex]2(a+b)[/tex].
Therefore, our required expression would be [tex]2(a+b)[/tex].