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0580/11 Oct/Nov 2021, Question 14: Simple Factorising

Cambridge IGCSE Mathematics 0580 · Paper 11 (Core) · Calculator · 4 marks

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The question, in short

Factorise 18x² − 12x fully, then expand and simplify (x + 5)(x − 3).

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Part (a) · 2 marks

Factorise 18x² − 12x completely.

  1. 1HCF of 18x² and 12x is 6x
  2. 218x² − 12x = 6x(3x − 2)

Answer6x(3x − 2)

Part (b) · 2 marks

Expand and simplify (x + 5)(x − 3).

  1. 1(x + 5)(x − 3) = x² − 3x + 5x − 15
  2. 2= x² + 2x − 15

Answerx² + 2x − 15

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Also searched as: 0580/11/O/N/21 · 0580_w21_qp_11 · 0580 w21 11 · question 14.
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