(a – b)^2 = ? (formula and example) [square of binomial] [binomial expansion]

Slide 02:
a minus b squared is
a squared
minus two a b
plus b squared.

Slide 03:
x minus three squared is
x squared
minus two times x times three
plus three squared.

Slide 04:
Which is,
x squared
minus six x
plus nine.