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= (16 - 8x)(1 + 4x) - (1 + 4x)
f ' (1) = (16 - 8)(1 + 4) - (1 + 4)
= 8(5) - 5
= 35
f (1) = (1 + 4)² (2 + 1) = 75
6f ' (1) + f(-1) = 210 + 75 = 285