SOLUTION: I need help solving x4 -5x2 - 36=0 I am not sure what to do with x4

Question 32364This question is from textbook Elementary and Intermediate alegbra
: I need help solving x4 -5x2 - 36=0 I am not sure what to do with x4 This question is from textbook Elementary and Intermediate alegbra

Answer by Cintchr(481) (Show Source): You can put this solution on YOUR website!
First, always try and solve by factoring. This one happens to be factorable.

-9 * 4 = 36 and -9 + 4 = -5

Continue factoring

Set each piece equal to zero
and and
and and
and and
and and
and and
and and
assuming your instructor wants ONLY real roots, then x = {3, -3 }
If s/he wants all roots ... x = { -3, 3, 2i }
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