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There are two ways to solve the equation. One is to simply factorise it and the other is to use the formula provided in the formula booklet. The second method is probably easier when there isn't a nice ea...

The perfect tense is used when the action being described has been completed while the imperfect tense implies that the actions is still ongoing or does not have a definite ending.

The passé composé (sometimes called the perfect tense) is used to describe an action in the past which has finished. In order to form this tense there are three parts of the verb-the subject, the auxilary...

Enzymes are proteins which catalyse (speed up without being used up) biological reactions. Each enzyme will only speed up one reaction as the shape of the enzyme molecule needs to match the shape of the m...

First, recognise that 3^2 = 9. Recall the rule for multiplying indices, that (a^b)^c = a^{bc}. Then, substitute 3^2 in place of 9 to get 3^{4x} = (3^2)^{(x-1)/2}. Use the rule for multiplying indices, so ...