(3x2 - 4x + 6) - (-2x2 + 4) + (-5x - 3)
(3x^2-4x+6)
-(-2x^2 +4) The signs change for the 2 and 4
____________________when you distribute the -1
( 5x^2 -4x +2)
+( -5x-3)
__________________
5x^2 -9x-1
-(-2x^2 +4) The signs change for the 2 and 4
____________________when you distribute the -1
( 5x^2 -4x +2)
+( -5x-3)
__________________
5x^2 -9x-1