Quadratic equations (fx-50FH II)

The program

As the editor shows it. When you finish, the editor's counter should read 071.

?→A:?→B:?→C:B²−4AC→D◢-B÷A÷2→X:√(Abs(D))÷A÷2→Y:If D≧0:Then X+Y◢X−Y◢Else X◢Y◢IfEnd:X◢C+BX÷2

One row per statement. Each row ends with EXE (the colon) or ◢.

The demo types the whole program into P1. Next step does one statement at a time.

Step 1 of 16

MODE 6 1 1 1: the editor, on area P1, in COMP.

MODE6111

Key 0 of 140 · Press Play to watch, or Next key to go one press at a time.

Example
Solve 2x² − 3x − 5 = 0, and find the vertex of y = 2x² − 3x − 5.

Δ = 49 > 0, so two real roots: x = 2.5 or x = −1. The vertex is (0.75, −6.125), the minimum since a > 0.

The demo keys the program into P1, then runs every example above.

Step 1 of 16

Prog 1 runs P1. It asks A?

Prog1

Key 0 of 26 · Press Play to watch, or Next key to go one press at a time.

Example
Solve x² + 2x + 5 = 0 (no real roots).

Δ = −16 < 0, so the roots are not real: x = −1 ± 2i. The vertex is (−1, 4).