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 Yearling
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Apr
26
comment Find value of k for distinct eigenvalues
The characteristic equation is $-\lambda^3 + 3\lambda + k = 0$.
Apr
21
revised Defining a Limit Point of A Set
added 243 characters in body
Apr
9
comment How expand an equation in powers of two variables?
Let $t=\frac{1}{r}$; you have $dt=-\frac{dr}{r^2}$.
Apr
7
comment Number of elements in a ring such that $x^2=1$
$x\cdot x \equiv 1 \mod(95)$
Apr
7
answered Number of elements in a ring such that $x^2=1$
Mar
27
awarded  Yearling
Mar
27
revised How would you solve for all solutions of $\sin(2x)=\cos(3x)$ algebraically?
added 5 characters in body; edited title
Dec
20
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 $A$.
Dec
20
comment How find the smallest $m$ such this $|A|=n,|B|=m,A\subseteq B$
I think $ m_{\min} \le {n \choose 2} $
Dec
20
revised How find the smallest $m$ such this $|A|=n,|B|=m,A\subseteq B$
edited body
Dec
19
awarded  Constituent
Dec
16
reviewed No Action Needed Vertex Equation of an inverse quadratic function.
Dec
11
comment Finding an interval containing the values of $ abc(a + b + c) $, given a quadratic constraint
Expand: $(ab + bc + ca)^2$
Dec
11
revised Finding an interval containing the values of $ abc(a + b + c) $, given a quadratic constraint
added 28 characters in body; edited title
Dec
10
answered Prove $x + \frac{1}{x} \geq 2$ for $x>0$.
Dec
10
revised Bob is 16. Grandma is 100. When will bob be half her age assuming both never die?
rolled back to a previous revision
Dec
9
revised What is the correct $\det(A^{-1})$
deleted 7 characters in body; edited title
Dec
9
reviewed Edit Linear Transformation of Complex Numbers
Dec
9
revised Linear Transformation of Complex Numbers
Improved formatting.
Dec
8
comment Proof for consecutive integers
Assume $n=3$; $n^3 = 27$ whereas $ \sum_1^3 x = 6 $.