Simplify (d^2+6d+9)+(d^3+6d+9)

$(d^{2} + 6 d + 9) + (d^{3} + 6 d + 9)$

Remove parentheses.

$d^{2} + 6 d + 9 + d^{3} + 6 d + 9$

Add $6 d$ and $6 d$ .

$d^{2} + 12 d + 9 + d^{3} + 9$

Simplify the expression.

Add $9$ and $9$ .

$d^{2} + 12 d + d^{3} + 18$

Move $12 d$ .

$d^{2} + d^{3} + 12 d + 18$

Reorder $d^{2}$ and $d^{3}$ .

$d^{3} + d^{2} + 12 d + 18$

$d^{3} + d^{2} + 12 d + 18$

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