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UPCAT Mathematics practice question 19: Expand: (x + 3)(x − 3)

Correct answer

B. x² − 9

This is the difference of two squares: (a + b)(a − b) = a² − b², so the middle terms cancel.

Expand: (x + 3)(x − 3)

  1. x² + 9
  2. x² − 9Correct
  3. x² + 6x − 9
  4. x² − 6x + 9

Why B is correct

This is the difference of two squares: (a + b)(a − b) = a² − b², so the middle terms cancel.

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