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= 2a(4a-1)+3(4a-1)
=(2a + 3)(4a-1)
2.
=6y^2 -4y + 9y -6
=2y(3y-2)+3(3y-2)
=(2y +3)(3y-2)
3.
=5x^2-2x +25x -10
=x(5x-2)+5(5x-2)
=(x+5)(5x-2)
4.
=2y^2 -y + 6y -3
=y(2y -1)+3(2y-1)
=(y+3)(2y-1)
smoga tidak keliru y, mohon ditelaah kembali.:-)