Algebra Ch 49: Binomial Theorem (12 of 18) Binomial Expansion Summary: Example

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We will use the general solution to solve the binomial expansion of (a+b)^3=?

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[me-tubemath]

we can see in the binomial expansion sum of exponent every term is equal to binomial expansion exponet.

[mrbaker]

Hi Sir, for differentiation, is dy/dx a fraction or ratio? I don't get why when doing things like U-substitution, we can multiply both sides by dx. I always thought that dy/dx is just an expression when y is differentiated with respect to x, and shld not be a fraction or ratio.

[aram]

Please tell us about (a-b)^n -- cause a+b is so well known...