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0 I want to create the twitter or facebook like #hashtags as like while create a post using #hashtags then separate these #hashtags & using for searches & want to show trending #hashtags as like #meteorjs #reactjs #hashtags #etc I'm using #reactjs for the frontend. I have not any idea how to implement this, can any #meteorjs experts guide me to overcome that. I'm a newbie on this stack. Thanks mongodb meteor hashtag meteor-react share | improve this question edited Nov 21 '18 at 9:39 jesica ...

2 2 $begingroup$ Problem: Given the points $$(0,1),(0,-1),(2,0),(-2,0),(1,1)$$ find the equation for the conic section that passes through these points. My attempt: Using the general equation for a conic section, $$ax^2+bxy+cy^2+dx+ey+f=0$$ I inserted the points to make a system of 5 equations, which was reduced to the following, with $a$ as a free variable. $$b=-a \c=4a \d=e=0 \f=-4a$$ Putting this into the general equation for a conic, I got $$ax^2-axy+4ay^2-4a=0 (1)$$ My question: Can I determine which type of conic section this is? I read somewhere that I can determine it by finding out the sign of $b^2+4ac$, where I ended up with $b^2-4ac = -15a^2 < 0$ which is supposed to be an ellipse. However, I can't find my way back to the place where I read this. Looking at the points on a graph, i...