Binary operation

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Question 21

$\begin{align}  & \text{If a binary operation }*\text{ is defined by   }x*y=x+2y,\text{ find }2*(3*4) \\ & (A)\text{ }26\text{  }(B)\text{ }24\text{ }(C)\text{ }16\text{  }(D)\text{ }14 \\\end{align}$

Question 21

A binary operation $\otimes $defined on the set of integers is such that m$\otimes $n = m + n + mn for all integers m and n. Find the inverse of  –5 under this operation, if the identity element is 0

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