Answer
6x + 31
Work Step by Step
( 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
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