6x² + x - 2, 12x² + 5x -2 G.C.D
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first factorize both quadratic polynomial
6x^2+x-2= 6x^2+4x-3x-2=2x(3x+2)-1(3x+2)
=(3x+2)(2x-1)
now factorize, 12x^2+5x-2
=12x^2+8x-3x-2
=4x(3x+2)-1(3x+2)
=(3x+2)(4x-1)
clearly, in both polynomial (3x+2) is common so HCF OR GCD is (3x+2)
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