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Aug
17
comment Find sum of $n$ terms of the series $12+14+24+58+164+\cdots$
@Bronshtein, Can you please share the steps to find the $n$th term ?
Aug
17
comment Simple solving Skanavi book exercise: $\sqrt[3]{9+\sqrt{80}}+\sqrt[3]{9-\sqrt{80}}$
math.stackexchange.com/questions/901131/…
Aug
17
answered $\operatorname{gcd}(ab,a+b)=1$ if $a$ and $b$ are relatively prime
Aug
17
answered Pre-calculus algebra logarithm question
Aug
17
revised Equation of parabola with focus and tangent
added 105 characters in body
Aug
17
comment Equation of parabola with focus and tangent
@Jay, Please find my answer
Aug
17
answered Equation of parabola with focus and tangent
Aug
17
comment Equation of parabola with focus and tangent
Show how to find the directix here?
Aug
17
comment Prove $ x^n-1=(x-1)(x^{n-1}+x^{n-2}+…+x+1)$
proofwiki.org/wiki/Sum_of_Geometric_Progression
Aug
17
revised Sum of the series $\frac{2}{5\cdot10}+\frac{2\cdot6}{5\cdot10\cdot15}+\frac{2\cdot6\cdot10}{5\cdot10\cdot15\cdot20 }+\cdots$
deleted 25 characters in body
Aug
17
comment Sum of the series $\frac{2}{5\cdot10}+\frac{2\cdot6}{5\cdot10\cdot15}+\frac{2\cdot6\cdot10}{5\cdot10\cdot15\cdot20 }+\cdots$
@kalpan, How about this?
Aug
17
comment Sum of the series $\frac{2}{5\cdot10}+\frac{2\cdot6}{5\cdot10\cdot15}+\frac{2\cdot6\cdot10}{5\cdot10\cdot15\cdot20 }+\cdots$
@ClaudeLeibovici, Thanks for your feedback. But, there were mistakes in the calculation.
Aug
17
revised Sum of the series $\frac{2}{5\cdot10}+\frac{2\cdot6}{5\cdot10\cdot15}+\frac{2\cdot6\cdot10}{5\cdot10\cdot15\cdot20 }+\cdots$
added 273 characters in body
Aug
17
comment Why is every number which ends in 5 divisible by 5?
math.stackexchange.com/questions/898096/…
Aug
17
answered How many solutions are there for this equation: $(x^2-x-1)^{x^2}=(x^2-x-1)$
Aug
17
answered Sum of the series $\frac{2}{5\cdot10}+\frac{2\cdot6}{5\cdot10\cdot15}+\frac{2\cdot6\cdot10}{5\cdot10\cdot15\cdot20 }+\cdots$
Aug
17
comment Proving that a number is non-negative?
@Macavity, Thanks for your observation
Aug
17
revised Proving that a number is non-negative?
edited body
Aug
17
comment Solve $5^{2x+2}-5^{x+2}+6=0 $
@JimmyK4542, Not much difference, right?
Aug
17
revised Solve $5^{2x+2}-5^{x+2}+6=0 $
added 137 characters in body