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if y=3x^2 + x -4 

then 

dy/dx = 6x + 1

setting this equal to zero gives

6x + 1 = 0

so then

x = -1/6

putting this x value back into the original equation gi...

Exams can often be quite daunting, and because English requires you to write essays rather than the shorter answers that are typical of other subjects, it's easy to see how you may open your paper and get...

A good acronym to remember is WEIRDO, standing for wishes, emotions, impersonal expressions, recommendations, doubt and ojalá. For example, espero que, dudo que, estoy contenta que, es importante que, rec...

The subjunctive "mood" is usually used to express a will/order or doubt/possibility. There are also certain phrases which the subjunctive always follows.

For example:

Il es...