What is the sum of the geometric series in which a1 = −5, r = 3, and an = −405?
a: -1220
b: 605
c: -15
d: -605

1. the parent function is defined for all and takes values (see red line in the attached diagram).

2. when reflecting over the y-axis, the domain of the function becomes and the range of the function is the same as the range of the parent function (blue line in the attached diagram).

this means that the function is the reflection of the function over the y-axis.