Question

Factorise he following:

a. 6x2 x - 1

Answer 1

Here is your answer 
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This is simple 

=> 

Given,
6x2 + x - 1
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=> 6x2 + 3x - 2x - 1

=> 3x(2x+1) -(2x+1)

=> (3x-1)(2x+1)

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Therefore the answer is =>  (3x-1)(2x+1)

Answer 2

=6x2 x-1
=6x2 3x-2x-1 (hence,3x-2x=x)
=3x(2x+1) -1(2x+1)
=(2x+1) (3x-1)