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WAEC 2019 · Paper 1 · Q20

Which of these values would make 3p−1p2−p\dfrac{3p - 1}{p^2 - p} undefined?

Worked solution (try it first)
  1. A fraction is undefined when its bottom is zero.
  2. Factorise the bottom: p2−p=p(p−1)p^2 - p = p(p - 1), which is zero when p=0p = 0 or p=1p = 1.
  3. Only 1 is an option, so the answer is option A.

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