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= 10y^2 - 3y - 40y + 12
= y(10y -3) - 4(10y -3)
= (y -4)(10y -3)
2. untuk c-, Kalikan a.c, kemudian pilih faktor perkalian yg jika dikurangi hasilnya b, dgn yg bernilai besar sama tanda operasi dgn b(+)
= 12x^2 -4x + 15x -5
= 4x( 3x - 1) + 5((3x-1)
= (4x + 5)(3x-1)
semoga tidak keliru y, mohon ditelaah kembali. :-)