Find all values of \(x\) such that \(x^2-5x + 4=0\). If you find more than one value, then list your solutions in increasing order, separated by commas.
x^2 - 5x + 4 = 0
Factor the left side as :
(x - 1) ( x - 4) = 0
Set both factors to 0 and solve for x and we have that x = 1, 4