factorise -6x sq +5-6
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Answer :
Now,
21 x² + 5 x - 6
= 21 x² + ( 14 - 9 ) x - 6
= 21 x² + 14 x - 9 x - 6
= 7 x ( 3 x + 2 ) - 3 ( 3 x + 2 )
= ( 3 x + 2 ) ( 7 x - 3 ),
which is the required factorization.
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