# Is it possible to factor y=x^2-5x+4 ? If so, what are the factors?

$\left(x - 1\right) \left(x - 4\right)$
$\text{the factors of + 4 which sum to - 5 are - 1 and - 4}$
${x}^{2} - 5 x + 4 = \left(x - 1\right) \left(x - 4\right)$