Eddie's Math and Calculator Blog

Numworks: Quadratic Equation and Newton's Method - Do Guesses Matter?   Introduction Let A, B, C, be positive, non-zero coefficients of ...

 Radio Shack EC-4019:   Catalan and Borel Triangles  Introduction:   Catalan and Borel Triangles  Catalan numbers counts a number of lattice...

Using Grand Total and Independent Memory for Complex Invoicing  Introduction Portable desktop (usually solar powered) calculators usually ha...

HP Prime: Psuedo Ordering of Complex Numbers  Can Complex Numbers be Ordered? Not really, not if you consider what is required to be an orde...

Review:  Casio  MC-12M Shop Calculator Just The Facts: Model:  MC-12M Shop Calculator  Company: Casio Type:  Desktop  Display:  12 digits Ba...

TI 84 Plus CE: Cauchy Fit Regression Note, in this blog capital and lower case letter variables are not assumed to be the same,  hence A ...

HP 12C:   Last X:   Sums and Products Introduction It is possible to use the LST X feature on the HP 12C calculators assist us in quick...

Random Numbers and Linear Regression The Test Case y = rand + x The goal is to see how good we can fit a line to the points generated ...

HP Prime and Casio fx-CG 50:   Binary Conversions  x = 2 * (1 + n)^p The program DECOM2 takes a real number, x, and decomposes it to th...

Casio fx-9750GIII and fx-CG50: System of Two Differential Equations, Runge Kutta 4th Order Introduction The program TWORK4 uses th...

HP 41C, HP 42S, TI-60:  Arithmetic-Geometric Mean Arithmetic-Geometric Mean The program AGM calculates the arithmetic-geometric mea...

Fun with the 71B '20 Differential Equations:  Runge Kutta Method 4th Order Find a numerical solution to the differential equation: ...

Solving Systems of Quadratic Equations This blog entry looks at four systems of quadratic equations. In each system, A, B, C, D, E, and...