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Jul
28
comment What three odd integers have a sum of 30?
9+1+5+5+5+5=30 using 3 integers where one gets used a few times to make up the missing piece.
Jul
17
revised (Discriminant) For which values of k will the equation g(x) = x + k have two real roots that are of opposite signs?
elaborated based on comment.
Jul
16
answered (Discriminant) For which values of k will the equation g(x) = x + k have two real roots that are of opposite signs?
Jul
16
comment Mod question: $-5 \pmod 3$?
What 3 numbers would you want to use to work mod 3? {0,1,2} and {-1,0,1} would be the most common ones I'd think.
Jul
16
answered Problem in proof of Chinese remainder theorem, and applying it.
Jul
15
comment Problem in proof of Chinese remainder theorem, and applying it.
Do you know how to combine congruences? For example, the first 2 congruences given would form x being congruent to 5 mod 6.
Jul
15
comment What is the first derivative of $1\over x$
Do you know the quotient rule?
Jul
15
answered Is $a^b$ larger than $b^a$ if $a<b$ and $a,b > 1$?
Jun
24
comment How to I factor these polynomial of degree $6$?
Have you tried substituting to values to see if you can find something to divide against the polynomial? That would be my initial suggestion.
Jun
21
reviewed Approve Need Suggestions for beginner who is in transition period from computational calculus to rigorous proofy Analysis
Jun
17
comment Simon invests $\$6000$ and it's compounded semi-annually for ten years
That would be the result of the first investment. What about the other $54,000 that Simon invests? There are 9 other investments he makes as I understand the question.
Jun
16
comment How many numbers of 4 digits contains at least one “5”?
The 4 digit number could have multiple 5s and should still be counted, e.g. 1055 or 5555 should count but would be missed in your count.
Jun
15
comment Paradox - minus one equals one using square roots
math.stackexchange.com/questions/438/… already addresses this question.
Jun
12
answered Why does the largest $x$ such that $a$, $b$ divided by $x$ leave the same remainder equal $a-b$?
May
27
comment Is $74*2^n - 1$ prime for some $n$?
What about $n=0$ as 73 is prime I believe.
May
21
comment Use quadratic formula to find upper and lower limits of an expression
Don't forget that multiplying 2 negatives can also yield a positive. For example, $y=1$ will work in your expression though you may not see this right away.
May
15
comment What are the values of $p$ so that equation $x^3+(p-2)x^2+(5-2p)x-10=0$ has exactly $2$ real roots…
$x^3-x^2=0$ has 2 roots: 0 and 1 as it factors into $x^2=0$ or $x-1=0$, thus there can exist a cubic with precisely 2 real roots.
May
15
awarded  Unsung Hero
May
14
answered Critique my proof? Proving f(x) is continuous at x = 0 for a defined function.
May
14
awarded  Nice Answer