What our “good” math teacher did, was to show us that (13+7)²=169+2*13*7+49.
Why “For Example” Is A Bad Way Of Explaining Things
Niklas Goeke

I believe it’s the inferring of equations from examples that makes people „understand“ concepts that can be used to a far greater extent than the equation your physics teacher taught you. Once you „see“ that the 169 originates in 13 etc, you can deduce similar formulas for far more complex equations.

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