Convert 7/11 to a decimal value.
7 divided by 11 = 0.636364
Subtract 0.636364 to 0.757576 and divide the difference
by 2.
Following the equation, 0.636364 - 0.757576 =
0.121212.
<span>0.121212 divided by 2, the quotient is 0.06 (06
is repeating) </span>
we have

Group terms that contain the same variable, and move the constant to the opposite side of the equation

Factor the leading coefficient

Complete the square. Remember to balance the equation by adding the same constants to each side


Rewrite as perfect squares

-----> equation in vertex form
therefore
the answer is the option C

The number 12 would work because subtracting 2 from 12 is ten and that's basically like adding 12 to -2 :)