Answer
$(3x^{4}-x^{2}+5)(x-1)$
Work Step by Step
Group in pairs...
... $= [3x^{4}\cdot x+3x^{4}\cdot 1]+ [-x^{2}\cdot x+(-1)]+[5\cdot x+5\cdot(-1)]$
... use the distributive property on each pair,
$=3x^{4}(x-1)-x^{2}(x-1)+5(x-1)$
... now, $(x-1)$ is a common factor. Use the distributive property.
= $(3x^{4}-x^{2}+5)(x-1)$
