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a) f(-3) = - 3(-3) - 6
= 3
f(2) = - 3(2) - 6
= - 12
b) f(a) = - 9
- 3a - 6 = - 9
- 3a = - 3
a = 1
f(-3) = -3(-3)-6
= 9-6
= 3
f(2) = -3(2)-6
= -6-6
= -12
b.
f(a) = -9
f(a) = -3a-6
-9 = -3a -6
-9 + 6 = -3a
-3 = -3a
1 = a