SOLUTION: Please help me solve 3x^4+13x^2-10=0. I believe I am supposed to use the substitution method, then the quadration formula. Thank you for your help.

Algebra ->  Expressions-with-variables -> SOLUTION: Please help me solve 3x^4+13x^2-10=0. I believe I am supposed to use the substitution method, then the quadration formula. Thank you for your help.      Log On


   

Question 347195: Please help me solve 3x^4+13x^2-10=0. I believe I am supposed to use the substitution method, then the quadration formula. Thank you for your help.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let u=x%5E2. then u%5E2=x%5E4
3u%5E2%2B13u%5E2-10=0
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u+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+
u+=+%28-13+%2B-+sqrt%28+13%5E2-4%2A3%2A%28-10%29+%29%29%2F%282%2A3%29+
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Once you solve for u, substitute back and find x.