Answer
7$x^{2}$ -2x + 2
Work Step by Step
the translation is
( 7$x^{2}$ + 3x + 9 ) - ( 5x + 7 )
(7$x^{2}$ + 3x + 9) + (-5x - 7 ) add the opposite
7$x^{2}$ + 3x + 9 - 5x - 7
7$x^{2}$ + 3x - 5x + 9 - 7 combine like trems
7$x^{2}$ -2x + 2 simplify