Simplify (6x^2+6x+9)+(x^2+2x)

$(6 x^{2} + 6 x + 9) + (x^{2} + 2 x)$

Step 1

Remove parentheses.

$6 x^{2} + 6 x + 9 + x^{2} + 2 x$

Step 2

Add $6 x^{2}$ and $x^{2}$ .

$7 x^{2} + 6 x + 9 + 2 x$

Step 3

Add $6 x$ and $2 x$ .

$7 x^{2} + 8 x + 9$