@coffeeandfun/maths-captcha/src/question-types/solve-x.js

Maths-Captcha is a simple Node.js module that generates random math questions to verify human interaction. It creates math problems like addition, subtraction, multiplication, division, powers, percentages, sequences, and algebra, and checks if the user's

import { randomInt, randomChoice } from '../random.js';

export function generateSolveForX(config) {
  const coefficient = randomInt(2, 9);
  const x = randomInt(1, 10);
  const constant = randomInt(1, 20);
  const sign = config.AVOID_NEGATIVE_RESULTS
    ? '+'
    : randomChoice(['+', '-']);

  const rightSide =
    sign === '+'
      ? coefficient * x + constant
      : coefficient * x - constant;

  return {
    question: `${coefficient}x ${sign} ${constant} = ${rightSide}`,
    answer: x.toString(),
    numericAnswer: x,
    operation: 'solve',
    operands: [coefficient, constant, rightSide],
    type: 'solve-x',
  };
}