Question 894558: If a new operation called # is defined as a # b = 2 (a-3b) then find -7#5
Answer by josgarithmetic(39620)   (Show Source):
You can put this solution on YOUR website! Just follow the formula. You have a symbolized definition for the # operation between two numbers, so just apply it.
What if you wanted x#y? this would be 2(x-3y) and you could continue into 2x-6y.
Now you should understand plainly what to do.
Your second expression to be answered seem ambiguous.
-7#5 either means (-7)#5 or -(7#5). Seeing through before doing the steps is difficult.
First way,
2((-7)-3*5)
2(-7-15)
2*(-22)
-44
Second way,
-(2(7-3*5))
-(2(7-15)
-2(-8)
16
These ways are not identical. Decide which way you want to begin with for that second example to be solved and then choose the steps accordingly (although I just did both of these).
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