# How do you simplify (6.9a^2-2.3b^2+2ab)+(3.1a-2.5b^2+b)?

$6.9 {a}^{2} - 2.3 {b}^{2} + 2 a b + 3.1 a - 2.56 {b}^{2} + b$
$6.9 {a}^{2} - 4.86 {b}^{2} + 2 a b + 3.1 a + b$