Mathematics A-Level
Sign change as a root-locating test
What Sign change as a root-locating test means in Mathematics A-Level, as defined for Pearson Edexcel.
Definition of Sign change as a root-locating test
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Reference: Pearson Edexcel
Evaluating f at successive x-values and looking for a sign change locates a root, provided the function is continuous and genuinely crosses.
Topics that use Sign change as a root-locating test
- Numerical methods (Pearson Edexcel A-Level)
Related terms
- Bisection and interval narrowing
- change of sign
- Cobweb and staircase diagrams
- cobweb diagram
- Concave up
- Convergence
- Convergence and the gradient condition
- divergence
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