Written working: sign diagrams and rational inequalities
Student Activity 𝅛 Sign Diagram 𝅛 Exam-quality Working 𝅛 Follow-up ⭕ Learning Focus SL and HL students: preserving the direction and domain of an inequality • recognising when multiplication by an unknown quantity is unsafe • identifying zeros and undefined values as significant points • constructing and interpreting a sign diagram • distinguishing excluded points from boundary values • checking a solution against...