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2h
answered If $\sqrt{n}+ 8= n+1$, what is $n$?
5h
comment How to compute $\int^{1}_{-1}f(x)dx$?
@math110, Not sure if I understood your point clearly.
14h
comment hard question, please help
See codegolf.stackexchange.com/questions/4019/…
14h
comment If we know $a^{1 / 2} + a^{-1/2}$, how can we calculate $a + a^{-1}$?
@PauloCosta, Use the formula, set $x=a^{1/2},y=a^{-1/2}$
15h
answered If we know $a^{1 / 2} + a^{-1/2}$, how can we calculate $a + a^{-1}$?
15h
comment Series with $n$th term having integer raised to the power of $n$ in the denominator
It's incorrect, we don't need it particularly though if you follow the linked answers.
15h
comment Series with $n$th term having integer raised to the power of $n$ in the denominator
The $n$th term $$=\frac{4\cdot5\cdot6\cdots(n+3)}{6\cdot9\cdot12\cdots(3n+3)},$$ right?
15h
comment Series with $n$th term having integer raised to the power of $n$ in the denominator
See math.stackexchange.com/questions/746388/…
17h
answered Quadratic formula not working?
18h
answered Vectors: $a = (1,2)$, $ b= (2,-1)$, $c = (-5, 20)$ Find values for $k$ and $l$ for $c = la + kb$
18h
comment Find all intergers such that $2n^2+1$ divides $n^3+9n-17$
@Ewin, Welcome. We still need to test for $2\le n\le8$. I'm thinking of reducing that like $n\not\equiv\pm2\pmod5$ as $153\not\equiv0\pmod5$
18h
answered Find all intergers such that $2n^2+1$ divides $n^3+9n-17$
22h
answered How to compute $\int^{1}_{-1}f(x)dx$?
1d
comment Angle in a triangle within a circle.
@ZubinMukerjee, I left it for Blakes7
1d
answered Angle in a triangle within a circle.
1d
comment Ellipse focal proof
@whyguy, How about this?
1d
answered Ellipse focal proof
1d
answered What is the closest point on the graph of $x^2-y^2=4$ to the point $(0,1)$?
1d
answered Find value of f(2013)?
1d
comment Can this be rewritten as the following?
$$x(x^2-1)-1(x-1)=x(x-1)(x+1)-1(x-1)=(x-1)[x(x+1)-1]=\cdots$$