## Algebra: A Combined Approach (4th Edition)

( 2$x^{2}$ + 7x - 9 ) + ( $x^{2}$ -x + 10 ) - ( 3$x^{2}$ -30) 2$x^{2}$ + 7x - 9 + $x^{2}$ -x + 10 -3$x^{2}$ + 30 2$x^{2}$ +$x^{2}$ -3$x^{2}$ + 7x - x -9 + 10 + 30 combine like terms 6x + 31 simplify