The difference of two squares

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The difference of two squares: Hiệu hai bình phương

/T͟Hē ˈdif(ə)rəns əv to͞o skwerz/

Tiếng Việt: Hiệu hai bình phương (a^2 – b^2 = (a+b)(a−b))

English: Two terms that are squared and separated by a subtraction sign like this: a^2 − b^2
              Useful because it can be factored into (a+b)(a−b): a^2 − b^2 = (a+b)(a−b)

Ví dụ/Example:
(x^2 – 1) = (x – 1)(x + 1)
(4x^2 – 1) = (2x + 1)(2x – 1)

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