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y+y=2y
x×x=x²
therefore, y+y-x×x=2y-x²

Group 7 of the periodic table contains all the elements known as halogens. They all have 7 valence electrons (hence group 7!) in their outer shell (insert diagram or prop to show what the outer shell sign...

Group one elements are all metals. They are known as the Alkaline Metals. All of these element atoms have one electron on their outer shell. This means that, when they react, they lose this one electron t...

The accusative is used for the direct object of a sentence. The direct object is the word (normally a noun) that receives the action of the verb. Example:Der Hund frisst den Toast - The dog eats the toast...

One of the differences between Chinese and English grammar is that in Chinese, we do not use 'tenses' in the same way as in English. In other word, there is no such things as 'ed,' 'has' 'had,' 'shall be,...