Answer:
c = 9.
Step-by-step explanation:
Complete the square:
x^2 - 6x + (-3)^2 = 0
x^2 - 6x + 9 = 0
(x - 3)^2 = 0
so the root is 3 and c = 9.
Subtract
x2
from both sides of the equation.
−6x+c=−x2
Add
6x
to both sides of the equation.
c=−x2+6x
