Question

Please help me answer and explain number 55

Answer 1

D

Explanation:

An operation of two real numbers is defined by the rule

`a\bigotimes b=b^a+2ab`

Calculate
`2\bigotimes (1\bigotimes 3).` First evaluate the expression in brackets:

`1\bigotimes 3=1^3+2\cdot 1\cdot 3=1+6=7`

Now,

`2\bigotimes (1\bigotimes 3)=2\bigotimes 7=2^7+2\cdot 2\cdot 7=128+28=156`