(2b ^ 2 + b - 3) + (2b ^ 2 - b - 3) =
To simplify the given expression (2b^2 + b - 3) + (2b^2 - b - 3), we need to collect like terms by combining the coefficients of similar terms.
First, let's rewrite the expression with the like terms grouped together:
2b^2 + 2b^2 + b - b - 3 - 3
Next, we combine the like terms:
4b^2 + (b - b) + (-3 - 3)
The terms (b - b) and (-3 - 3) simplify to 0, so they disappear from the expression:
4b^2 + 0 - 6
Simplifying further, any number added to 0 is equal to the number itself:
4b^2 - 6
Therefore, the simplified form of the given expression is 4b^2 - 6.