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= -4+2-4
= -2-4
= -6
f(-2)= -2.(-2)+(-2)-4
= 4+(-2)-4
=-2
f(a+2)= -2(a+2)+a+2-4
=-2a-4+a+2-4
=-a-6
a=-6
f(a-2)=(-6-2)
= -2(-6-2)+(-6-2)-4
= 12+4+(-6-2)-4
=16+(-8)-4
=4
f(2 ) = -2 (2) + (2) - 4
= -4+2-4 = 2
f(-2) = -2(-2) + (-2) -4
= 4-6 =-2
f(a+2) = -2(a+2) + (a+2) -4
= -2a -4 + a +2 -4
= -a + 2
f(a-2) = -2(a-2) + (a-2) -4
= -2a+4 + a -2 -4
= -a - 2