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m →Quadratic formula: throw in an 'implies' at the end, in case it helps someone |
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Line 82:
:<math>
\underbrace{a \parallel a \parallel \cdots \parallel a}_{n\text{ times}}
= \frac1{\underbrace{\dfrac1a + \dfrac1a + \cdots + \dfrac1a}_{n\text{ times}}} = \frac an
</math>
Line 88:
:<math>
n (\underbrace{a \parallel a \parallel \cdots \parallel a}_{n\text{ times}}) = a.
</math>
Unlike for [[multiplication and repeated addition|repeated addition]], this does not commute: <math>a / b \neq b / a.</math>
=== Binomial expansion ===
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