# How do you simplify  (3+a^2+2a) + (a^2 - 8a +5)?

The value of this expression is: $2 {a}^{2} - 6 a + 8$
$\left(3 + {a}^{2} + 2 a\right) + \left({a}^{2} - 8 a + 5\right) = 3 + {a}^{2} + 2 a + {a}^{2} - 8 a + 5 = 8 + 2 {a}^{2} - 6 a = 2 {a}^{2} - 6 a + 8$