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**IDontunderstand** Find the solution y=x^2-4x+3 and y=x-1 so I have

If I want to factor the expression x^2-5x+4

I can find the roots (x-1)(x-4) I was shown another but I cannot remember correctly how to do it because it doesnt work but it should

if you put the factors in a square and take out common terms (numbers and signs, I believe that can only take out neg if both have it) I need a neg 1 and 4 outside to get the

x 4

x x^2 -4x

1 -1x 4

Any help where I am going wrong will be greatly appricated Thanks