a = -16 b = 0 c = 541
Use the quadratic formula which is
x = [-b +- sq root (b^2 -4ac)] / 2a
x = [-0 +-sq root (0 -4-16541)] / 2 -16
x = + - sq root (0 -4-16541) / -32
x = + - sq root (34,624) / -32
x = + - 186.075 / -32
x1 = 186.075 / -32 =
-5.81484375
x2 = -186.075 / -32 =
5.81484375