SOLUTION: x^4-9x^2+20 Can you please help me solve this quadratic equation

Question 664184: x^4-9x^2+20 Can you please help me solve this quadratic equation
Found 2 solutions by Alan3354, ReadingBoosters:
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
x^4-9x^2+20 Can you please help me solve this quadratic equation
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There's no equal sign, so it's not an equation.

Answer by ReadingBoosters(3246) (Show Source): You can put this solution on YOUR website!
Starting with
x^4 - 9x^2 + 20 = 0
(x^2 - )(x^2 - ) = 0 both negative due to - 9 and + 20
Find common multiple of 20 that adds to -9
(x^2-5)(x^2-4) = 0
(x^2-4) can be factored further
(x^2-5)(x+2)(x-2)
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