Please help. And thank you

If g(x) is an odd function, which function must be an even function?

A33 gram sample of a substance that's used to detect explosives has a k-value of 0.1473. n = noekt no = initial mass (at time t = 0) n = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time, in days

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?