Question

Factorise : x2-1 - 2a - a2

Answer 1

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Answer 2

x2-1 -2a-a2

=x2-(1+2a+a2)

= formula ( a+b )².

= x2-(1² +2×1×a + a2 )

= x2-(1+a)² ....... formula [a2-b2 =(a+b) (a- b)]

= (x+1+a) (x-1-a)

:= 2 is the square of that number .

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