I keep finding goofy things in our new pre-calc text.
It's bad enough that it just presents "facts" without any proof. If I remember correctly (we haven't gotten to this topic yet), it just presents the Law of Sines and the Law of Cosines without proof! It just presents them as being delivered directly from Heaven on tablets. Several important points are presented without proof.
Then there's stuff I'd consider wrong.
For you math types out there, what would you consider to be the standard form of the equation of a parabola? For me, without any hesitation, I'd say standard form is y=ax^2+bx+c. Our new textbook, though, says standard form is y=a(x-h)^2+k, which is similar to what I'd call vertex form, namely (y-k)=a(x-h)^2, a form that would graph a parabola with vertex (h,k).
If we can't agree on standard form, it's not very standard, is it?