factorise:
(1) 12x^2-7x+1
(2) 2x^2+7x+3
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1) 12x²-4x-3x+1
= 4x(3x-1)-1(3x-1)
= (3x-1)(4x-1)
2) 2x²+7x+3=2x²+6x+x+3
= 2x(x+3)+1(x+3)
= (x+3)(2x+1)
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