SOLUTION: x^4+8x^2=9

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Question 387969: x^4+8x^2=9
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
x%5E4%2B8x%5E2=9---->x%5E4%2B8x%5E2-9+=+0---->%28x%5E2%2B9%29%28x%5E2+-+1%29+=+0. Then either x%5E2+%2B+9+=+0, or x%5E2+-+1+=+0. From the first we get no real solutions. From the second, we get x = 1, -1.