Question

using identity, factorise: a square - 1 - 2b - b square.​

Answer 1

Answer:

Step-by-step explanation:

Answer 2

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$<b><marquee> ---__--- QUESTION ---__--- ⤵⤵⤵⤵</marquee></b>$

Factorise :

a² - 1 - 2b - b²

$<b><marquee>---__---ANSWER ---__--- ⤵⤵⤵⤵</marquee></b>$

= a² - 1 - 2b - b²

= a² - ( 1 + 2b + b² )

= a² - 1[ (1)² + 2(1)(b) + (b)² ]

We know,

[ m + n ]² = m² + 2mn + n²

= a² - ( 1 + b )²

We know,

a² - b² = ( a + b ) ( a - b )

= ( a + 1 + b ) ( a - 1 - b )

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