Algebraic Pattern Math Example 2

Follow the full solution, then compare it with the other examples linked below.

Example 2

hard
Factor x3โˆ’27x^3 - 27 by identifying the pattern.

Solution

  1. 1
    Step 1: Recognize: x3โˆ’27=x3โˆ’33x^3 - 27 = x^3 - 3^3 (difference of cubes).
  2. 2
    Step 2: Apply a3โˆ’b3=(aโˆ’b)(a2+ab+b2)a^3 - b^3 = (a - b)(a^2 + ab + b^2) with a=x,b=3a = x, b = 3.
  3. 3
    Step 3: (xโˆ’3)(x2+3x+9)(x - 3)(x^2 + 3x + 9).
  4. 4
    Check: (xโˆ’3)(x2+3x+9)(x-3)(x^2+3x+9) at x=3x = 3: 0ร—27=00 \times 27 = 0 and 27โˆ’27=027 - 27 = 0 โœ“

Answer

(xโˆ’3)(x2+3x+9)(x - 3)(x^2 + 3x + 9)
The difference of cubes a3โˆ’b3=(aโˆ’b)(a2+ab+b2)a^3 - b^3 = (a-b)(a^2 + ab + b^2) is one of several key algebraic patterns. Perfect cubes to recognize: 1,8,27,64,125,...1, 8, 27, 64, 125, ...

About Algebraic Pattern

A recognizable, recurring algebraic structure such as a2โˆ’b2a^2 - b^2 or (a+b)2(a+b)^2 that can be applied systematically.

Learn more about Algebraic Pattern โ†’

More Algebraic Pattern Examples