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(-13x^2+39x-56) please help me factor
I don't understand it with big (and negative) numbers

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Unfortunately, this cannot be factored perfectly :|

I can only change it to -13(x-3)x - 56

And FYI, -13x^2 + 39x -56 = 0 has no solutions. That's why it cannot be factored perfectly.
User Zstefanova
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