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x²+2x+1=0, (x+1)(x+1)=0, (x+1)²=0. So x=-1

When using the auxilary "avoir" the past participle's ending agrees both is gender and number with the direct object only when it is placed before the verbs' subject.  Here's an example: Le chat...

I recommend using study cards.  Write down the spanish word on one side and the english word on the other side. Set yourself the task of learning 5 words a day and ask someone to test you.

A personal statement should be tailored to yourself. It should be enticing as a University admissions team is probably bored of reading the same old thing. You should sell yourself to the University and h...

The differential of a function is defined by the expression: dy/dx = Lim(dx->0) of (f(x+dx)-f(x))/dx. For functions only involving powers of x, the differentioal can easily be calculated by timesing by...