SOLUTION: Can you show me how to solve: Find the real solutions of the equation by factoring. 2x^4 - 18x^2 =0

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Question 498286: Can you show me how to solve: Find the real solutions of the equation by factoring. 2x^4 - 18x^2 =0
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+2x%5E4+-+18x%5E2+=+0+
+2x%5E2%2A%28+x%5E2+-+9+%29+=+0+
This is true if either:
+x+=+0+ or
+x%5E2+-+9+=+0+
+x%5E2+=+9+
+x+=+3+
+x+=+-3+
This is a 4th degree equation, so there should be 4 roots
The +x+=+0+ is called a "double root", so the 4 roots are
+x+=+0+
+x+=+0+
+x+=+3+
+x=+-3+