Question

helpplease?

Answer 1

if u complete the square u will see it is the 4th one.

Answer 2

Hint: use the quadratic formula. The standard form of a quadratic equation is \[x=\frac{ -b \pm \sqrt{b^2-4ac} }{ 2a }\]
and in this case, a = -n, b = t, and c = c. Good luck!