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**Jubbly** Hey guys, I was wondering if someone can help me through a step by step guide on writing in vertex form.

I have this equation: -2x^2+6x+1

On this equation I factored out the 2 leaving me with: 2(x^2+3x)+1

Then I did (3/2)^2 and came out with 9/4.

At this point the book lost me, I can't seem to find out what to do next after finding that.

On perfect squares I don't even know how to find the value of k.

I have this equation: x^2-kx+100=0

I think I would have to subtract 100 from both sides, but I'm not sure.

Thanks for your help!