In school, I was the kid asking “when will I ever use this?” about quadratic equations. Turns out the answer is “every time you build literally anything.”
Want to calculate what resistor to use with an LED? Ohm’s law. Want to tune a synth oscillator to a specific note? Logarithms. Want to figure out if a gear ratio will give you enough torque? Ratios and proportions. Want to aim a projectile in a game? Trigonometry. Want to train a neural net? Linear algebra and calculus.
The difference between math in school and math in a project is motivation. When you need the answer because your circuit won’t work without it, suddenly the formula isn’t abstract anymore. It’s the thing standing between you and a working project.
I’m going to write about math as I encounter it in my builds — not as a textbook chapter, but as the tool I reached for when something wasn’t working. The math that actually shows up, in the moment you actually need it.
So stop watching math lectures at 2x speed. Go build something that needs a number you don’t have yet. You’ll learn the formula in five minutes because you’ll actually need the answer. That’s the only way math ever stuck for me.
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