Here are 4 examples of solving 4th degree polynomial equations (i.e. quartic equations) by factoring. These are the introductory problems you should know for your algebra or precalculus class. For a challenging equation, check out https://youtu.be/-qWd6352NqE
0:00 Solve x^4-81=0
3:29 Solve x^4-13x+36=0
5:55 Solve x^4-5x^3+8x-40=0
11:20 Solve 4x^4-x^2-8x-16=0
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