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December 18, 2014

December 18, 2014

Posted by **Robo** on Tuesday, May 31, 2011 at 1:39pm.

2x^4 + x^2 = 1

- Algebra -
**Rebecca**, Tuesday, May 31, 2011 at 1:45pmFollow these steps:

1.Move all terms to one side of the equation, usually the left, using addition or subtraction.

2.Factor the equation completely.

3.Set each factor equal to zero, and solve.

4.List each solution from Step 3 as a solution to the original equation.

- Algebra -
**Robo**, Tuesday, May 31, 2011 at 2:23pmI understand that. Problem is that I am not getting the same answer as the book.

Sqrt 2/2 and - sqrt 2/2

- Algebra -
**Mike**, Tuesday, May 31, 2011 at 3:39pmx= } 1/2

- Algebra -
**MathMate**, Tuesday, May 31, 2011 at 3:48pmSubstitute y=x²

2y²+y-1=0

Solve to get

y=-1 or y=1/2

if x²=-1, x=±i

if x²=1/2, x=±(1/2)=±(√2)/2

- Algebra - typo -
**MathMate**, Tuesday, May 31, 2011 at 3:49pmif x=1/2, x=√(1/2)=(√2)/2

- Algebra -
**algebra**, Wednesday, June 1, 2011 at 6:51amThanks! got it.

- Algebra -
**MathMate**, Wednesday, June 1, 2011 at 8:08amYou're welcome!

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