Discrete change modelled by first- and second-order difference (recurrence) equations, homogeneous and inhomogeneous, including financial and growth applications. *(New-spec Strand 4 "modelling incremental change", a topic with no old-syllabus equivalent.)* Sub-topics: first-/second-order difference & recurrence equations, homogeneous/ inhomogeneous solutions, characteristic equation, geometric sequences, compound interest, loan repayment.
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