How many zero pairs must be added to the function

f(x) = x - 10x - 4 in order to begin writing the function in

vertex form?

4

10

21

25

Option 4 - 25

Step-by-step explanation:

Given : Function

To find : How many zero pairs must be added to the function  in order to begin writing the function in  vertex form?

Solution :

The vertex form is

Let function

Applying completing the square,

Add and subtract square of half of the coefficient of x,

i.e.

Therefore, the zero pairs must be added to the function  in order to begin writing the function in  vertex form is 25.

So, Option 4 is correct.