(2b^2 + b - 3) + (2b^2 - b - 3) = ?
To simplify the expression, you need to combine like terms.
(2b^2 + b - 3) + (2b^2 - b - 3)
= 2b^2 + b - 3 + 2b^2 - b - 3
= (2b^2 + 2b^2) + (b - b) + (-3 - 3)
= 4b^2 + 0 - 6
= 4b^2 - 6
Therefore, (2b^2 + b - 3) + (2b^2 - b - 3) simplifies to 4b^2 - 6.