Asked by Cooper

Define a#b=ab-a-b+1 for all real numbers a and b. x # 7 = 42. What is the value of x?
Answered by Reiny
We are told : a#b=ab-a-b+1

so x#7 = 7x - x - 7 +1 = 42
6x = 48
x = 8
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