Answer:
in terms of i is: 
Step-by-step explanation:

We know that 
so,

Now solving:

So,
in terms of i is: 
Answer:
-12
Step-by-step explanation:
Here the given expression is

And the given value of x=5 . We need to find the value of y when x=5. And for that, we need to plug 5 for x .

So when x=5, y= 7.6