Simplify Find the sum of x^2+3x and -2x^2+9x+5

Find the sum of $x^{2} + 3 x$ and $- 2 x^{2} + 9 x + 5$

Step 1

Write the problem as a mathematical expression.

$x^{2} + 3 x - 2 x^{2} + 9 x + 5$

Step 2

Subtract $2 x^{2}$ from $x^{2}$ .

$- x^{2} + 3 x + 9 x + 5$

Step 3

Add $3 x$ and $9 x$ .

$- x^{2} + 12 x + 5$