Question: Let a function of 2 variables be defined by (a, b) = ab (a b). What is the value of (8,9)? A. 89

Let a function of 2 variables be defined by ƒ(a, b) = ab − (a − b). What is the value of ƒ(8,9)?
A. 89
B. 73
C. 71
D. 34
E. 0

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