Question

what do i have to add (c) to make it a perfect square
v^2-8v+c

Answer 1

c = (-8/2)^2 to form a perfect square Remember squaring a negative results in a positive

Answer 2

Take half of the 'v' coefficient to get (-8)/2 = -4

Then square that result: (-4)^2 = 16


So the value of 'c' is c = 16