hjpotter92
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 Apr9 comment How expand an equation in powers of two variables? Let $t=\frac{1}{r}$; you have $dt=-\frac{dr}{r^2}$. Apr7 comment Number of elements in a ring such that $x^2=1$ $x\cdot x \equiv 1 \mod(95)$ Apr7 answered Number of elements in a ring such that $x^2=1$ Mar27 awarded Yearling Mar27 revised How would you solve for all solutions of $\sin(2x)=\cos(3x)$ algebraically? added 5 characters in body; edited title Dec20 comment How find the smallest $m$ such this $|A|=n,|B|=m,A\subseteq B$ $B$ should have the sum of all pairs of integers from $A$. Dec20 comment How find the smallest $m$ such this $|A|=n,|B|=m,A\subseteq B$ I think $m_{\min} \le {n \choose 2}$ Dec20 revised How find the smallest $m$ such this $|A|=n,|B|=m,A\subseteq B$ edited body Dec19 awarded Constituent Dec16 reviewed No Action Needed Vertex Equation of an inverse quadratic function. Dec11 comment Finding an interval containing the values of $abc(a + b + c)$, given a quadratic constraint Expand: $(ab + bc + ca)^2$ Dec11 revised Finding an interval containing the values of $abc(a + b + c)$, given a quadratic constraint added 28 characters in body; edited title Dec10 answered Prove $x + \frac{1}{x} \geq 2$ for $x>0$. Dec10 revised Bob is 16. Grandma is 100. When will bob be half her age assuming both never die? rolled back to a previous revision Dec9 revised What is the correct $\det(A^{-1})$ deleted 7 characters in body; edited title Dec9 reviewed Edit Linear Transformation of Complex Numbers Dec9 revised Linear Transformation of Complex Numbers Improved formatting. Dec8 comment Proof for consecutive integers Assume $n=3$; $n^3 = 27$ whereas $\sum_1^3 x = 6$. Dec8 revised How to solve the congruence $x^4 + x + 3 = 0 \pmod{3^3}$? added 11 characters in body Dec8 revised Proof for consecutive integers added 6 characters in body; edited title