Lesson 48 of 84 · Quadratic Equations
hard⭐ 30 XP🧬 X LabQuadratic Equations: 7x + 20 = 111
In this Grade 9 lesson on Quadratic Equations, you will practice solving problems like: "Solve for x: 7x + 20 = 111". Work through each problem carefully, use the hints if you need help, and check your answers. This builds your understanding of quadratic equations step by step.
Worked Examples
Next Smart Lesson
We'll pick a lesson that matches exactly where your math is right now.
✨More to explore
🌍 Where you'd use this: Anytime someone says 'figure out X if you know Y' — you're doing algebra.
🤯 Fun fact: 🤯 The pattern 1, 1, 2, 3, 5, 8, 13… (Fibonacci) shows up in flower petals, pinecones, and hurricanes.
🏆 Try this week: Find one real-life situation today that uses an unknown. Write the equation for it.
👨👩👧 At dinner: “If x equals your age, what's 2x + 5? What does that number mean?”
Challenge a friend
Send it to a parent looking for a 5-minute math win that doesn't feel like homework.
Ready?
Quadratic Equations: 7x + 20 = 111
Same on both sides — that's the rule, that's the trick.
Full screen — no distractions
Checkout complete lesson on Quadratic Equations for 9th Grade
Get the full Quadratic Equations track as a printable PDF — all lessons, worksheets, and answer keys.