Mathematician Finds Easier Way to Solve Quadratic Equations

[Albert Chan]

Hi, 7alken

Welcome to the forum!

The trick to force quadratic regression line == quadratic equation to solve. (*)
Let N = number of data points (N=0 when calculator memory is cleared)

{N,f(N)}, entered 3 times, we have points {0,f(0)}, {1,f(1)}, {2,f(2)}

If f is quadratic, quadratic regression line = f --> regression line roots = f roots.

For casio fx-82ms (2nd), variable C=N, thus {C,F(C)} work.
For other models, you may need to figure out what variable stored N

(*) your video link example, f(x) = 112*x^2 + 100*x - 525
If you checked regression lines, you'll see C, B, A = 112, 100, -525
Points are used to indirectly enter these coefficients.