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12x^2 -6x+ 20× -10 =
12x^2 + 14x -10 .....dibagi 2 !
6x^2 + 7x -5
(2x-1) (3x+5)
× = 1/2 atau x = - 5/3(tidak mungkin -)
jadi panjang = 3.1/2 + 5 =6,5 dan lebar = 4.0,5 -2 =0