Simplify the number using the imaginary unit i: (square root) -28

a. 2(square root) -7
b. -2(square root) -7
c. i(square root) 28
d. 2i(square root) 28

C

Step-by-step explanation:

Imaginary Number   is defined as the square root of

We can write:  

Now, we want to simplify  

We can use the formula to simplify it further:

Using the fact that  ,  we can write:

This is answer choice C.

answer: evaluate the objective function at each vertex to determine which - and -values, if any, maximize or minimize the function. example: find the minimum value and maximum value of the objective function f ( x , y ) = 4 x + 5 y , subject to the following constraints