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f(x) = −(3)x − 1 + 3,
1-3 range(−(3)x − 1 + 3,
when x=1
−(3)1 − 1 + 3,=-1+3=2
whenx=3
−(3)3 − 1 + 3,=-9+3=-6
Hence 2+-6=-4
-4
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