(х 2 – 5х + 4)(х 2 – 5х + 1) = 28;

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To simplify this equation, we first need to expand the left side:

(х^2 - 5х + 4)(х^2 - 5х + 1) = 28

х^4 - 5х^3 + 4х^2 - 5х^3 + 25х^2 - 20х + 4х^2 - 20х + 16 = 28

Now, let's combine like terms:

х^4 - 10х^3 + 33х^2 - 40х + 16 = 28

Now, let's set the equation equal to zero to solve for x:

х^4 - 10х^3 + 33х^2 - 40х - 12 = 0

At this point, we can use numerical methods or factorization to solve for the values of x that satisfy this equation.