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NECO 2023 · Paper 1 · Q32

Expand (x−2)(x+6)(x - 2)(x + 6).

Worked solution (try it first)
  1. Multiply each term in the first bracket by each in the second: x2+6x−2x−12x^2 + 6x - 2x - 12.
  2. Collect the xx terms: 6x−2x=4x6x - 2x = 4x.
  3. So (x−2)(x+6)=x2+4x−12(x - 2)(x + 6) = x^2 + 4x - 12, option A.

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