Normal rules mean x takes precedent over +, so you get 24 +4x. But if you mean 12(2+4x) then it's 24+48x
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12x2-23x+10 = (3x-2)(4x-5) when factored
(4x - 1) (3x + 2)
3X3 + 12X2 + 9X 3X(X2 + 4X + 3) 3X(X + 1)(X + 3) --------------------------------far as can be factored and you should see X intercepts of original function
(4x - 7)(3x + 5)
x2 + 12x2 + 35 = 13x2 + 35 which cannot be factorised in any sensible way.