GCSE Maths (Edexcel)

435 videos | 33 hours

Advanced Quadratics - Inspection Method

Please subscribe to watch this video.

This, and all other videos, are included in our premium subscriptions.

Premium accounts get access to all videos.

Algebra Notation, Vocabulary and Manipulation

Advanced Quadratics - Inspection Method

6:26 Factorisation
Spec A1 A4
Previous Factorising the Difference of Two Squares Next Advanced Quadratics - Splitting Method
  • Some quadratics with coefficients of x squared greater than one can be difficult to factorise using the regular splitting method
  • These quadratics can be factorised by inspection using the cross method
  • To factorise using the cross method, find a factor pair for the quadratic term and a factor pair for the constant term
  • Multiply one factor from each pair along diagonal lines and add the products to get the linear term
  • Experiment with different factor pairs until the correct match is found
  • Once the correct match is found, add horizontally to find what goes in the double brackets
  • Always check the answer by expanding the double brackets to ensure it matches the original expression
  • Repeat the process if the correct factor pairs are not initially found
  • Make sure to consider negative factors when finding factor pairs for negative constant terms
  • It is important to check the answer by expanding the double brackets to verify correctness.

Please subscribe to access these revision notes.

This, and all other video notes, are included in our premium subscriptions.

Premium accounts get access to all videos and revision notes.