Coaching Centre
Equations and inequations
Solve linear and quadratic inequations, use the discriminant to answer questions about roots and tangents, and work with quadratic identities.
Sections
- 4A Linear equations and inequations Solve linear equations and inequations, including fractions, and know exactly when to reverse the inequality sign.
- 4B Quadratic equations and inequations Solve quadratic inequations by sketching the parabola or using a table of test points, and write the answer as inequalities or intervals.
- 4C Using the discriminant Apply the discriminant to find unknown coefficients, decide whether roots are real, equal or rational, and find when a line is tangent to a parabola.
- 4D Quadratic identities The difference between an identity and an equation, equating coefficients, and finding the quadratic that passes through three given points.