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Which one of the following is a solution to the equation x4 − 2x2 ... ...

Which one of the following is a solution to the equation x4 − 2x2 = −1 ?
(A)    0
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Nova Math - Problem Set A: Substitution

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Posted: 07/24/2012 18:59
How do you know which questions are looking for only on answer?
Contributor
 
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Posted: 07/25/2012 01:53
The question will say explicitly that there is more than one answer and you are supposed to choose multiple.
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Which one of the following is a solution to the equation x4 − 2x2 ... ... 
Posted: 10/31/2013 12:37
Why did you plug in 0 to the 4th power instead of just 0?
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Posted: 11/01/2013 14:01
Melissa, because we are trying to find the answer to x^4 - 2x^2 = -1, so when we plug in x=0, we have to raise it to the power of 4. It's a quick calculation anyway.
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