curl --request POST \
  --url https://api.iotools.cloud/v1/tool/quadratic-formula-solver \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "coeffA": "1",
  "coeffB": "-5",
  "coeffC": "6"
}
'

{
  "tool": "quadratic-formula-solver",
  "tool_version": "1.0.1",
  "outputs": {
    "roots": "x₁ = 3, x₂ = 2",
    "discriminant": "1",
    "steps": "a = 1, b = -5, c = 6\nDiscriminant: Δ = b² − 4ac = (-5)² − 4(1)(6) = 1\nΔ > 0 → two distinct real roots\nx = (−b ± √Δ) / (2a) = (5 ± √1) / (2)\nx₁ = 3\nx₂ = 2"
  },
  "credits_used": 3,
  "credits_remaining": null
}