Define the binary operator ⋆ by: a ⋆ b = a + 4 b Simplify each of the following. Do the order of operations (do what is in parentheses first). a) ( 6 ⋆ 7 ) ⋆ 4 = b) ( 2 ⋆ 5 ) ⋆ 3 = Step by step, please

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter1: Fundamentals
Section1.4: Binary Operations
Problem 6E
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Define the binary operator ⋆ by: a ⋆ b = a + 4 b Simplify each of the following. Do the order of operations (do what is in parentheses first). a) ( 6 ⋆ 7 ) ⋆ 4 = b) ( 2 ⋆ 5 ) ⋆ 3 =

Step by step, please

 

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I was told it was wrong and the answer is 77 

I dont

understand what im doing wrong

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Follow-up Question

Define the binary operator ⋄⋄ by:

     a⋄b=7a+7b 

and □ by:

     a□b=a2+b2

Find the following.  When simplifying, use the order of operations, that is, do the parentheses first.

 (4 ⋄ 5)□ 2=

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