GCSE Maths (AQA)

435 videos | 33 hours

Advanced Changing the Subject

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 Changing the Subject

6:27 Formulae
Spec A5
Previous Advanced Quadratics - Splitting Method Next Expanding Squared Brackets
  • Rearranging formulae involving indices and products of variables can be more difficult
  • Example: x^2 + 2z + y = z, rearranging to make x the subject is more difficult
  • Steps involved in rearranging: get rid of power of 2 by taking square root of both sides
  • Example: 2y = ���(x+3), rearrange to make x the subject
  • Step 1: Perform inverse operation to +3, subtract 3 from both sides
  • Step 2: Perform inverse operation to square root, square both sides
  • Example: AB + C = BD - E, rearrange to make B the subject
  • Step 1: Perform inverse operation to +BD, subtract BD from both sides
  • Step 2: Perform inverse operation to +C, subtract C from both sides
  • Step 3: Factorize both sides to get B(A-D) = -(C+E)
  • Step 4: Perform inverse operation to multiply by -(A-D), divide both sides by (A-D)
  • Example: y = 2z^2 + 5, rearrange to make z the subject
  • Step 1: Perform inverse operation to +5, subtract 5 from both sides
  • Step 2: Perform inverse operation to multiply by 2, divide both sides by 2
  • Step 3: Perform inverse operation to square, take square root of both sides

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.