Evaluate (10x^2+3x+9)+(5x^2+x+4)

$(10 x^{2} + 3 x + 9) + (5 x^{2} + x + 4)$

Step 1

Remove parentheses.

$10 x^{2} + 3 x + 9 + 5 x^{2} + x + 4$

Step 2

Add $10 x^{2}$ and $5 x^{2}$ .

$15 x^{2} + 3 x + 9 + x + 4$

Step 3

Add $3 x$ and $x$ .

$15 x^{2} + 4 x + 9 + 4$

Step 4

Add $9$ and $4$ .

$15 x^{2} + 4 x + 13$