SOLUTION: Please help me solve {{{b^4 + b^2

SOLUTION: Please help me solve {{{b^4 + b^2 - 20 = 0}}}

Question 6533: Please help me solve
Found 2 solutions by longjonsilver, Shin123:
Answer by longjonsilver(2297) (Show Source): You can put this solution on YOUR website!
this is just a quadratic...let , so the equation becomes

so, now factorise to (a+5)(a-4) = 0
--> a = -5 or a = 4

so or

so b = +2 or -2 or b = + or -

jon.

Answer by Shin123(626) (Show Source): You can put this solution on YOUR website!
Let a=b². Then the equation becomes a²+a-20=0. Factoring leaves So a=-5 or a=4. So we have and So the real solutions are b=2 and b=-2. (Note:The imaginary solutions are and ).
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