Simplify 3x^2+11x+20+(10x^2-21x-3)

$3 x^{2} + 11 x + 20 + (10 x^{2} - 21 x - 3)$

Step 1

Remove parentheses.

$3 x^{2} + 11 x + 20 + 10 x^{2} - 21 x - 3$

Step 2

Add $3 x^{2}$ and $10 x^{2}$ .

$13 x^{2} + 11 x + 20 - 21 x - 3$

Step 3

Subtract $21 x$ from $11 x$ .

$13 x^{2} - 10 x + 20 - 3$

Step 4

Subtract $3$ from $20$ .

$13 x^{2} - 10 x + 17$