N.CN.9

(+) Extend polynomial identities to the complex numbers. For example, rewrite x^2 + 4 as (x + 2i)(x-2i).

Example Problems
Write as a product of linear factors.
Write as a product of linear factors.
Expand and combine like terms:
Khan Academy Resources
Factor polynomials: complex numbersFactoring polynomials using complex numbersFactoring sum of squaresComplex numbers & sum of squares factorization
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