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  • Expanding any expressions in brackets: (r3+s3)(r3-s3)
Multiple choice

Expanding any expressions in brackets: (r3+s3)(r3-s3)

  1. r9-s9

  2. r6+2rs+s6

  3. r6-s6

  4. r2+2rs+s2

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is a difference of squares: (a + b)(a - b) = a^2 - b^2. Here, a = r^3 and b = s^3. So, (r^3)^2 - (s^3)^2 = r^6 - s^6.

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