How Liam Delap is able to work out cube roots quickly and look like a maths genius, and the simple trick you can learn to do it yourself

The Chelsea striker has gone viral for his ability to immediately give the answer to a tricky-sounding maths question ...
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Unknown Quantity: A Real and Imaginary History of Algebra

§RU.1 IN MY PRIMER ON THE SOLUTION of the general cubic, I mentioned the cube roots of 1 (§CQ.4). There are three of these little devils. Obviously 1 itself is a cube root of 1, since 1×1×1 = 1. The ...