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Algebra Difficulty 1.3 Junior Find the answer
The operation ∇ is defined by a∇b=4a+b. What is the value of (5∇2)∇2?
A number or a short expression. Spacing and $ signs are ignored.
Solution
Using the definition, (5∇2)∇2=(4×5+2)∇2=22∇2=4×22+2=90.
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