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(x+3)(x-7) = (x x) + (x -7) + (x 3) + (3 -7) = x^2 - 7x + 3x - 21 = x^2 - 4x - 21 Key here is to ensure you multiply each term in one bracket by both in the other, and to keep careful track of the signs.

The first lexical device Burns explores is repetition. This is a key method in rhetoric because it establishes importance, and ensures the reader pays attention to the word repeated. The word "red"...

To form the imperfect active subjunctive, you take the perfect active infinitive of a verb and you add endings that are (almost) identical to the usual present active indicative verbs. For example, the 3rd p...

Receptor: There are different types of receptors within the peripheral nervous system. There can be free nerve endings for pain and other types of receptors within the layers of the skin for sensations such ...

Nitrogen fixation is one stage of the nitrogen cycle. The nitrogen cycle describes the different transformations of the forms of nitrogen in nature. The nitrogen cycle is important because plants need nitrog...