2 Answers

Hendry Lim · Answer 1 · 2022-01-09T02:18:49+0000

Explanation:

These are identities .

$:\implies$ ( a + b)²

$:\implies$ ( a + b) ( a + b)

$:\implies$ a ( a + b ) + b ( a + b)

$:\implies$ a² + ab + ab + b²

$:\implies$ a² + 2ab + b²

$:\implies$ ( a - b)²

$:\implies$ ( a - b) ( a - b)

$:\implies$ a ( a - b ) - b ( a - b)

$:\implies$ a² - ab - ab + b²

$:\implies$ a² - 2ab + b²

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