I was given a spring in a 10 times dapmening with a 1 kg mass and a constand of 16N/m.

I have come out with the equation that x(t) = C_1 (e^-8t) + C_2 (e^-2t)

then it ask: intaially the spring starts out at 1 meter below equilbrium

so i put that x(0) = 1

then i try to find the constants and i come out with 1 = c_1+C_2 which gets me no where. What am i missing ?