according to Math logic of MDAS the answer would be:
12*2/5=4.8
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12x2 + 20x - 25 IS a polynomial that factors into (2x + 5)(6x - 5)
12x2-23x+10 = (3x-2)(4x-5) when factored
(4x - 7)(3x + 5)
12x2 - 28x - 15= 12x2 - 18x - 10x - 15= 6x(2x - 3) - 5(2x - 3)= (6x - 5)(2x - 3)
(6x - 5)(2x + 5) assuming you missed a minus sign....