Rewrite as .

Let . Substitute for all occurrences of .

Consider the form . Find a pair of integers whose product is and whose sum is . In this case, whose product is and whose sum is .

Write the factored form using these integers.

Replace all occurrences of with .

Multiply the constant in the polynomial by where is equal to .

Multiply the constant in the polynomial by where is equal to .

Since both terms are perfect squares, factor using the difference of squares formula, where and .

Rewrite as .

Since both terms are perfect squares, factor using the difference of squares formula, where and .

Multiply by .

Remove unnecessary parentheses.

Factor over the Complex Numbers x^4+170x^2+169