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y''=d²y/dx², y'=dy/dx for ease of writing

First off split the full equation into th homogeneous equation and the particular function. 

The homogen...

The preterite is used to describe events that happened only once and have finished.

e.g. Antonio hizo sus deberes = Antonio did his homework (only once)

The imperfect, on the other hand, is ...

To answer this we want to split up the 'a' parts and 'b' parts of the question and answer them seperately because we can't answer the question with two letters. We can change one equation to b=16-6a and n...

The subjunctive (el subjuntivo) is a mood, not a tense and it is used frequently in Spanish. It can be used to describe past events with the imperfect subjunctive, or present events with the present subju...

In this speech, Lady Macbeth is reading a letter from her husband in which he tells her what has happened with the witches. The audience already know all that has happened, so rather than focussing on the...