Answer and explanation

Correct answer: C.

  1. Step 1: The common factor of and is .
  2. Step 2: .
Answer
.
Why not the others: is what you get if you take out the wrong common factor. is what you get if you leave out the numerical common factor. is what you get if you take out only the number.

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Factorise 20x 2 - 4x… | GCE O/L Mathematics (Sri Lanka)