Formula
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A formula is a shortened way of writing an idea. They are often used in Mathematics and Science. Formulae (the plural) use letters instead of words. The simplest formula is y = x. Here, if x is, for example, 1, then y = x so y = 1. Possibly the most famous formula is E = m × c 2. Albert Einstein created this. In it, E is energy, m is mass and c is the speed of light. Thus, energy = mass × (multiplied by) the speed of light 2 (squared).