{
  "id": "foil-method-calculator",
  "version": "1.0.0",
  "name": "FOIL Method Calculator",
  "shortName": "FOIL Method",
  "description": "Expand two linear binomials using the FOIL method.",
  "category": "Math & Statistics",
  "categorySlug": "math-statistics",
  "keywords": [
    "foil",
    "method",
    "calculator",
    "foil method calculator"
  ],
  "status": "live",
  "workStatus": "pending",
  "reviewStatus": "pending",
  "migrationStatus": "new",
  "engine": "native",
  "creator": null,
  "reviewer": null,
  "quality": {
    "availability": "live",
    "technicalReviewRecord": "/reviews/foil-method-calculator.json",
    "qualifiedReview": "pending",
    "qualifiedReviewer": null,
    "qualifiedReviewDate": null,
    "formulaVersion": "1.0.0",
    "referenceCoverage": "references-pending",
    "releaseTestScope": "Catalog and regression checks are not a professional formula audit; consult release evidence.",
    "historicalMetadataDate": "2026-09-01",
    "historicalMetadataNotice": "The imported date is not evidence of a completed human review."
  },
  "urls": {
    "page": "/calculator/foil-method-calculator/",
    "definition": "/calculator/foil-method-calculator/definition.json",
    "schema": "/calculator/foil-method-calculator/schema.json",
    "llms": "/calculator/foil-method-calculator/llms.txt",
    "legacyDefinition": "/calculator/foil-method-calculator.json"
  },
  "queryExample": "https://askcalculators.com/calculator/foil-method-calculator/?a=2&b=3&c=4&d=-5",
  "queryParameters": {
    "a": {
      "label": "a in (ax + b)",
      "type": "number",
      "required": true,
      "default": 2
    },
    "b": {
      "label": "b in (ax + b)",
      "type": "number",
      "required": true,
      "default": 3
    },
    "c": {
      "label": "c in (cx + d)",
      "type": "number",
      "required": true,
      "default": 4
    },
    "d": {
      "label": "d in (cx + d)",
      "type": "number",
      "required": true,
      "default": -5
    }
  },
  "inputs": [
    {
      "id": "a",
      "label": "a in (ax + b)",
      "type": "number",
      "required": true,
      "defaultValue": 2,
      "step": 0.001
    },
    {
      "id": "b",
      "label": "b in (ax + b)",
      "type": "number",
      "required": true,
      "defaultValue": 3,
      "step": 0.001
    },
    {
      "id": "c",
      "label": "c in (cx + d)",
      "type": "number",
      "required": true,
      "defaultValue": 4,
      "step": 0.001
    },
    {
      "id": "d",
      "label": "d in (cx + d)",
      "type": "number",
      "required": true,
      "defaultValue": -5,
      "step": 0.001
    }
  ],
  "outputs": [
    {
      "id": "expanded",
      "label": "Expanded polynomial",
      "format": "text",
      "primary": true
    },
    {
      "id": "xSquaredCoefficient",
      "label": "x² coefficient",
      "format": "number",
      "digits": 8
    },
    {
      "id": "xCoefficient",
      "label": "x coefficient",
      "format": "number",
      "digits": 8
    },
    {
      "id": "constant",
      "label": "Constant",
      "format": "number",
      "digits": 8
    },
    {
      "id": "steps",
      "label": "FOIL terms",
      "format": "text"
    }
  ],
  "formula": {
    "expression": "(ax + b)(cx + d) = acx² + (ad + bc)x + bd"
  },
  "examples": [
    {
      "label": "Reproducible default-input example (not a personal recommendation)",
      "inputs": {
        "a": 2,
        "b": 3,
        "c": 4,
        "d": -5
      }
    }
  ],
  "sources": []
}