The Hidden Power of X
Like Duolingo, but for The Hidden Power of X. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
For the part of you with thirty open tabs that never became anything.
Free forever · No credit card · iPhone & Android

Key ideas in The Hidden Power of X
- The equals sign represents a state of perfect balance
- Inverse operations can 'undo' changes to a variable
- Changing only one side of an equation creates an inequality
- Operations must be mirrored on both sides to maintain the relationship
- Predicting the outcome of an unbalanced operation on a balanced equation
- Sequencing the steps to isolate a variable while maintaining balance
- Performing the same operation on both sides preserves the balance
- Equations can have different numerical forms but represent the same truth
- Inverse operations and mirrored changes
- The total is the sum of known and unknown parts
- Subtracting the known part from the total isolates the hidden value
- Algebraic solving follows the reverse order of operations
- The goal of solving is to get the unknown value by itself
- Variables represent the 'missing piece' of information
- The equals sign represents the balance between the process and the result
- Connecting real-world 'mysteries' to their mathematical representations
You've tried the other tabs
Thirty open tabs. Four facts you actually kept.
You watched. You nodded. By Sunday it was gone.
One answer, then back to scrolling.
Eight weeks. You meant to finish. You didn't.
Tomo gives The Hidden Power of X the Duolingo treatment: levels, streaks, and quick quizzes that test what you just learned. That game loop is what the tabs above never had, so it's the one you actually finish.
Here's what playing it feels like
A real question from this course. Take your best guess.
If a variable has been increased by 5, what tool would you use to 'undo' that change and find the original value?
Get it right to open this lesson and 29 more in the app.
Where The Hidden Power of X takes you
Stop memorizing formulas and start solving life's puzzles. Discover how invisible numbers, flexible patterns, and the laws of chance help us predict the future and map the unknown.
- 1
Solve Real World Puzzles
- Thinking in Balances
- Finding the Missing Piece
- Using Letters to Save Time
- The Art of Undoing Math
- Predicting Trends with Lines
- 2
Master the Invisible and the Curved
- When Numbers Take a Turn
- The Magic of Imaginary Numbers
- Mapping Shapes on a Grid
- How Fast Things Change
- 3
Predict the Unpredictable
- The Odds of Anything
- Finding the Middle of the Data
- Spotting Lies in Graphs
- Why the House Always Wins
- The Bell Curve in Real Life
- Sampling the Whole World
3 sections · 15 units · 30 levels. Built to play, not to enroll.
You pick the voice
The Hidden Power of X is taught in the The Professor style: clear, structured, thorough. Want a different feel? In the app you can spin up the same topic in any of Tomo's teaching styles. Same facts, totally different vibe.
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Start The Hidden Power of X today.
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