Why don't you try a little on your own ?
And what exactly d'you want ? Solve for y=0 ? Or express x with y ?
I wanted to solve for x, hence the topic. I tried it before , but I got (-1 + square root 15) /2, which was totally not the answer. That's why I wanted the steps, to show me how to get there. I know the answer, it's 0.145... and -1.145... I just need to know how to get round it.