Algebra menu

When it helps

P1 of the one-calculator pack. Each item reads a, b and c first, so the four share their opening and fit in 232 bytes. A cubic with a known root runs straight on into the quadratic for its quotient, so you get all three roots in one go.

At each prompt

• Menu item 1: Quadratic: a, the coefficient of x², b, the coefficient of x, c, the constant term
• Menu item 2: Cubic, one root known: a, the coefficient of x³, b, the coefficient of x², c, the coefficient of x, d, the constant term, k, the root you know (or the k in x − k)
• Menu item 3: Simultaneous equations: a₁, the x coefficient of the first equation, b₁, its y coefficient, c₁, its right-hand side, a₂, the x coefficient of the second equation, b₂, its y coefficient, c₂, its right-hand side
• Menu item 4: Sequences: a, the first term, r, what each term is multiplied by (1 for an arithmetic sequence), d, what is then added (0 for a geometric sequence), K, the sum to pass