// Define the id of your board in BOARDID
const board = JXG.JSXGraph.initBoard(BOARDID, {
boundingbox: [-9, 9, 9, -9],
axis: true
});
// Coefficients [a_0, ..., a_n] of a polynomial,
// starting with a_0, a_1, ...
var coefficients = [-1, 3, -9, 1, 0, 0, -8, 9, -9, 1];
var roots = JXG.Math.Numerics.polzeros(coefficients);
for (let i = 0; i < roots.length; i++) {
board.create('point', [roots[i].real, roots[i].imaginary], {
withLabel: false,
fixed: true
});
}
board.create('text', [-8, 3, JXG.Math.Numerics.generatePolynomialTerm(coefficients, coefficients.length - 1, 'x', 0)]);