Question 665821
{{{x^3-4x^2+5x-2}}}..replace {{{-4x^2}}} with {{{-2x^2-2x^2}}}, and {{{5x}}} with {{{4x+x}}} 

{{{x^3-2x^2-2x^2+4x+x-2}}}..group


{{{(x^3-2x^2)+((-2x^2+4x)+(x-2))}}}


{{{x^2(x-2)+(-2x(x-2)+(x-2))}}}


{{{x^2(x-2)+(-2x+1)(x-2))}}}


{{{(x^2+(-2x+1))(x-2)}}}


{{{(x^2-2x+1)(x-2)}}}


{{{(x-1)^2(x-2)}}}