> You don't need a whole page of quadratic equations, in fact you don't understand it if you get to the end and think you need more. OTOH, if you only do the fi

> You don't need a whole page of quadratic equations, in fact you don't understand it if you get to the end and think you need more. OTOH, if you only do the first two and you think you get it, you might be enlightened when you look at some further questions. You do a couple of them and you get superficial understanding. You might even have a decent mechanical grasp of how it works. But I'm yet to meet someone who can take topics of adequate complexity and actually internalise them without a fairly large amount of (progressively harder) repetition