  We update results on the QCD equation of state in (2+1)-flavor QCD with
non-zero conserved charge chemical potentials obtained from an eighth-order
Taylor series. We present results for basic bulk thermodynamic observables of
strangeness-neutral strong-interaction matter, i.e. pressure, number densities,
energy and entropy density, and resum Taylor series results using Pad\'e
approximants. Furthermore, we calculate the speed of sound as well as the
adiabatic compression factor of strangeness-neutral matter on lines of constant
entropy per net baryon number. We show that the equation of state ($P(n_B),
\epsilon (n_B)$) is already well described by the $4^{\rm th}$-order Taylor
series in almost the entire range of temperatures accessible with the beam
energy scan in collider mode at the Relativistic Heavy Ion Collider.
