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Forum: Challenge Questions and Puzzles

Have a challenging question or puzzle you want to share with the community? Post it here (homework questions do NOT belong here).

  1. Sticky Thread Sticky Threads

    • Replies: 1
    • Views: 1,649
    October 8th, 2013, 03:20 Go to last post
  1. Normal Thread Normal Threads

  2. Differentiation challenge

    Started by Theia, Yesterday 18:06
    differentiation, find, form, fracmathrmdymathrmdx, fracx
    • Replies: 2
    • Views: 46
    Today, 03:46 Go to last post
  3. Trig inequality challenge

    Started by lfdahl, Yesterday 18:51
    cos, fracn2sqrt2], inequality, left, trig
    • Replies: 0
    • Views: 18
    Yesterday, 18:51 Go to last post
  4. Area of quadrilateral ABCD

    Started by Albert, January 1st, 2017 00:22
    • Replies: 2
    • Views: 134
    January 16th, 2017, 22:46 Go to last post
    • Replies: 1
    • Views: 133
    January 10th, 2017, 07:28 Go to last post
  5. product with limit

    Started by jacks, December 31st, 2016 14:01
    $displaystyle, evaluate, limit, lim_nrightarrow, product
    • Replies: 2
    • Views: 126
    January 8th, 2017, 07:12 Go to last post
  6. Range of function in [0,1]

    Started by jacks, January 5th, 2017 04:37
    1right]$, frac1+x^0.61+x^0.6;forall, function, left[0, range
    • Replies: 2
    • Views: 117
    January 8th, 2017, 07:07 Go to last post
  7. Prove (x+y+z)+(a+b+c)≥1

    Started by anemone, January 3rd, 2017 11:12
    $a+b+c^2+x+y+z^2ge, numbers, prove, x+y+z+a+b+c≥1, z0$
    • Replies: 4
    • Views: 150
    January 5th, 2017, 04:49 Go to last post
  8. Evaluate a sum

    Started by anemone, December 31st, 2016 03:38
    evaluate, frac3n^2+1n^3-n^3, sum, sum_n1
    • Replies: 3
    • Views: 137
    January 1st, 2017, 01:02 Go to last post
  9. sum of 100 terms (continued)

    Started by Albert, December 29th, 2016 20:33
    equal, numbers, prove, terms, test
    • Replies: 3
    • Views: 128
    December 31st, 2016, 17:27 Go to last post
  10. number of real roots in polynomial equation

    Started by jacks, December 30th, 2016 08:11
    0$$, equation, number, real, roots
    • Replies: 3
    • Views: 165
    December 31st, 2016, 11:00 Go to last post
  11. Find the sum of three trigonometric terms

    Started by anemone, December 29th, 2016 10:55
    10^circ+tan^4, 50^circ+tan^4, 70^circ, calculator, evaluate
    • Replies: 2
    • Views: 129
    December 30th, 2016, 13:17 Go to last post
  12. Sum of a hundred terms

    Started by anemone, December 21st, 2016 12:45
    $a_1, a_100$, a_2, cdots, equal, hundred, numbers, prove
    • Replies: 6
    • Views: 238
    December 29th, 2016, 09:02 Go to last post
  13. find f(2002)

    Started by Albert, December 25th, 2016 23:42
    2 Pages
    1 2
    $f2002$, $ffx+fy=x+y, f2002, find, yin
    • Replies: 16
    • Views: 374
    December 28th, 2016, 10:14 Go to last post
  14. Find the area of the "Dodecagon"

    Started by Albert, December 27th, 2016 17:00
    $dodecagon, area, dodecagon, expressed, find
    • Replies: 1
    • Views: 86
    December 28th, 2016, 04:54 Go to last post
  15. prove all a_ns are integers

    Started by Albert, December 25th, 2016 23:32
    a_n, integer$, prove, term
    • Replies: 2
    • Views: 84
    December 26th, 2016, 13:42 Go to last post
  16. proof in predicate calculus

    Started by solakis, December 23rd, 2016 16:03
    forall, neg, predicate, xin, yleftrightarrow
    • Replies: 0
    • Views: 67
    December 23rd, 2016, 16:03 Go to last post
  17. Find The Maximal

    Started by anemone, December 18th, 2016 09:28
    $2a^2-6a+b^2=0$, $a^2+2a+b^2$, condition, find, maximal
    • Replies: 3
    • Views: 120
    December 21st, 2016, 09:18 Go to last post
  18. a convex quadrilateral

    Started by Albert, December 16th, 2016 04:54
    $geq, 2s$, convex, diagonal, quadrilateral
    • Replies: 1
    • Views: 123
    December 19th, 2016, 07:48 Go to last post
  19. area of rectangle ABCD

    Started by Albert, December 13th, 2016 10:15
    • Replies: 4
    • Views: 170
    December 19th, 2016, 06:44 Go to last post
  20. Factorization Challenge

    Started by anemone, December 16th, 2016 12:58
    $x^2+y^2+z^2-2xy-2yz-2zx$, challenge, factorization, factorize
    • Replies: 2
    • Views: 132
    December 16th, 2016, 22:05 Go to last post
  21. find the area of triangle ABQ

    Started by Albert, December 8th, 2016 10:50
    • Replies: 1
    • Views: 129
    December 15th, 2016, 09:35 Go to last post
  22. Prove 1 ≤ x+y+z ≤ 2

    Started by anemone, December 11th, 2016 00:12
    $1le, $xy+yz+zx=1$, 1]$, prove, x^2+y^2+z^2le
    • Replies: 6
    • Views: 208
    December 14th, 2016, 11:36 Go to last post
  23. find f(600)

    Started by Albert, December 8th, 2016 19:53
    $f500=3$, $f600$, f600, function, y0$
    • Replies: 3
    • Views: 120
    December 8th, 2016, 22:18 Go to last post
  24. Infinite sum

    Started by greg1313, November 26th, 2016 19:00
    evaluate, infinite, sum
    • Replies: 7
    • Views: 325
    December 5th, 2016, 19:52 Go to last post
  25. find min(n)

    Started by Albert, December 4th, 2016 01:55
    $find, a_2times, a_3times------times, a_n=2006$, minn$
    • Replies: 1
    • Views: 121
    December 5th, 2016, 17:18 Go to last post
  26. number of real solution

    Started by jacks, December 1st, 2016 02:09
    $ln2pi, number, real, solution
    • Replies: 1
    • Views: 138
    December 4th, 2016, 23:37 Go to last post
  27. find max(abs(a)+abs(b)+abs(c)), and a possible f(x)

    Started by Albert, November 30th, 2016 10:46
    cright, find, fx$, |+left, |leq1
    • Replies: 3
    • Views: 146
    December 4th, 2016, 01:20 Go to last post
  28. find x:y:z

    Started by Albert, November 15th, 2016 22:19
    $find, find, xyz, xyz$
    • Replies: 2
    • Views: 185
    December 3rd, 2016, 22:18 Go to last post

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