They are wrong.
2x^2(2x^2-9)=0
2x^2(xsqrt2-3)(xsqrt2+3)=0
so the roots are 0,0,3/sqrt2, -3/sqrt2)
4x^4-18x^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!
2 answers
Why did you square root the second line? Would you please be able to explain? Thanks!
1 answer