(а+б)2

The expression \((a + b)^2\) represents the square of the binomial sum \(a + b\). To expand this expression, you can use the formula for the square of a binomial:

\[ (a + b)^2 = a^2 + 2ab + b^2 \]

So, the expanded form of \((a + b)^2\) is:

\[ a^2 + 2ab + b^2 \]