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AMC 10/12
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Textbook
1. Introduction
2. Algebra
2.1 Manipulation
2.2 Functions (polynomial)
2.3 Functions (trigonometric)
2.4 Functions (exponential and logarithmic)
2.5 Functions (sequences)
2.6 Functions (other)
3. Geometry
4. Number theory
5. Probability
6. Combinatorics
7. What's next?
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2.1 Manipulation
Achievable AMC 10/12
2. Algebra

Manipulation

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Algebraic Manipulation

Are you a master of the kinds of algebraic manipulation you need in order to do great on the AMC?

In order to answer “yes,” you should be able to do any of the following when needed, without any hints or prompting:

  • notice, and factor, a difference of squares (i.e. x2−y2=(x−y)(x+y))
  • notice, and factor, a difference or sum of cubes
  • notice, and factor, a few others like that

Examples

  • When you see x2−2xy+y2, do you immediately and automatically think of (x−y)2 ?
  • And do you also immediately think that adding 4xy to the original expression will change (x−y)2 to (x+y)2 ?

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