tolong kerjakan no 9 dan 10 ya beserta caranya makasih.

9. Ix+4I + I5-2xI - Ix-2I x>10

=> (x+4) + (-(5-2x)) - (x-2)
=> (x+4) + (-5+2x) - (x-2)
=> x+4-5+2x-x+2
=> 2x+1

10. I3x-6I - Ix-4I Ix+1I 2<x<4

=> (3x-6) - (-(x-4))(x+1)
=> (3x-6) - (4-x)(x+1)
=> (3x-6) - (4x+4-x^2-x)
=> (3x-6) - (-x^2+3x+4)
=> 3x-6+x^2-3x-4
=> x^2 - 10