EL4 Check It

[AbbyANoble]

The logarithmic equations in EL4 are nonstandard in their display. They include things like a adding a negative number (without parentheses) instead of subtraction. And +0 at the end of some. My guess is that the equation was defined in pieces, and the pieces were inserted in an outline that had a constant at the end.

The ones below are versions 1 and 2 from https://tbil.org/preview/precalculus/exercises/#/bank/EL4/1/.

I'd prefer them to look more standard, like $-\log_2 (x) -3$ and $-\log_4 (x+2)$.

[siwelwerd]

Yeah... here's what happens if you try and use log(x,2) for example:

It handles all the equation stuff nicely but just turns $\log_2 x$ into $\frac{\log x}{\log 2}$ which is not wrong, but not helpful for students here.

I can imagine a way to hack this further to look nicer, but before I do that maybe @StevenClontz has an idea on how to convince Sage to display $\log_2 x$.

[siwelwerd]

Wonder if this is the way...

from sage.symbolic.function_factory import function_factory
logb = function_factory('logb', 1, '\\log _b')
latex(logb(x))
latex(-1*logb(x)+(-3))

$-\log _b\left(x\right) - 3$