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Algebra
Vieta's formulas
Relate roots to coefficients of a quadratic.
Practise →Sum of cubes of roots
Find r³ + s³ from a quadratic's coefficients.
Practise →Systems of equations
Solve two linear equations, two unknowns.
Practise →Arithmetic series
Sum the first n terms of an AP.
Practise →Geometric series
Sum the first n terms of a GP.
Practise →Remainder theorem
Find a polynomial remainder the fast way.
Practise →AM–GM inequality
Minimise x + c/x with AM–GM.
Practise →