a + b - I think of two numbers and add them together., 2a - I think of a number and double it., a2 - I think if a number and multiply it by itself. , 2a + 1  - I think of a number, double it and add 1., 3a - I think of a number and treble it., 2(a + 1) - I think of a number, add one and then double it.,

Algebra Notation

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