College Algebra / Unit 5 Alg 237 short lesson, about 20 seconds
The Assumed-Linearity Error
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The idea
The assumed-linearity error rewrites f(a + b) as f(a) + f(b); most functions refuse the split.
In practice
For f(x) = x²: f(1 + 4) = 25, while f(1) + f(4) = 1 + 16 = 17 — squaring a binomial term by term, reborn.
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