Posted by Katie on Wednesday, October 7, 2009 at 5:22pm.
4x^418x^2=0. I have to find out what x equals by factoring. What I did was
Factor 2x^2(2x^2+9)=0 then 2x^2(2x+3)(x+3), resulting in 1.5 and three. But these answers are wrong according to my book. Can you show me step by step how to do this correctly? It would be a huge help!

Algebra  bobpursley, Wednesday, October 7, 2009 at 6:07pm
They are wrong.
2x^2(2x^29)=0
2x^2(xsqrt23)(xsqrt2+3)=0
so the roots are 0,0,3/sqrt2, 3/sqrt2)

Algebra  Katie, Wednesday, October 7, 2009 at 6:35pm
Why did you square root the second line? Would you please be able to explain? Thanks!
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