Question

x^2 - 4x + c = 0
the answer is 4 but how do I find the C??

Answer 1

you have to get c by it self

Answer 2

you have to use a method called "completing the square"

Answer 3

so subtract -x^2 from both sides

Answer 4

okay

Answer 5

if you said that the answer is 4, just insert 4 in for x and solve for c

Answer 6

oh I see I feel dumb now haha