Question
Factorise$ : 3a^2- 1 - 2a$
✓
Answer
$3a^2 - 1 - 2a$
$= 3a2 - 2a - 1$
$= 3a2 - 3a + a - 1$
$= 3a( a - 1 ) + 1( a - 1 )$
$= ( 3a + 1 )( a - 1 )$
$= 3a2 - 2a - 1$
$= 3a2 - 3a + a - 1$
$= 3a( a - 1 ) + 1( a - 1 )$
$= ( 3a + 1 )( a - 1 )$
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