Question 936434: Hello, I would like some help here:
"If a*b=a-3b and a#b=2a+3b, evaluate the expression (4*3)#5."
The trouble for me here relies on the meaning of this symbol: "#" Could you tell me what that means? And moreover, how can or does it apply to the problem?
Thank you in advance,
Marcelino
Found 3 solutions by srinivas.g, josgarithmetic, MathLover1:
Answer by srinivas.g(540)   (Show Source):
You can put this solution on YOUR website! In General, # is not have any significance pertaining to maths
But in this problem, # is defined as a condition. we have to use those conditions to solve the problem
given conditions : a8b=a-3b a#b=2a+3b
4*3 = 4-3(3) ( here a=4 , b=3)
= 4-9
=-5
(4*3)#5 = (-5)#5
(-5)#5 = 2(-5)+3(5) ( here a=-5 b= 5)
=-10+15
= 5
Result :(4*3)#5 =5
Answer by josgarithmetic(39620)  (Show Source):
You can put this solution on YOUR website! You can only follow the two formulas to understand the operation symbols, * and #.
Trust the grouping symbols as you already know them.
Looking at the example formulas with the operators for guidance, first evaluate 4*3; and then evaluate that with #5. You might also show the entire grouped expression and first find the "simplified" expression for (4*3)#5, treating (4*3) as a separate number; and then .... no... find out what is r=4*3 AND THEN find what is r#5.
Reread that and think carefully about it.
Do you see what to do?
Final result should be 5.
Answer by MathLover1(20850)  (Show Source):
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