# How do you add (x^3+8x^2+19x+12)+(x^2+4x+3)?

${x}^{3} + 9 {x}^{2} + 23 x + 15$
we can add $8 {x}^{2} + {x}^{2} = 9 {x}^{2}$
$19 x + 4 x = 23 x$
$12 + 3 = 15$