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(x+3)(x-7)

= (xx) + (x-7) + (x3) + (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...

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 3r...

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 su...

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 nit...

Go through conjugating verb after verb after verb to root the conjugation in the student's mind and then start using it in sentences by saying the sentence in english and asking them to translate and then...