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### Topic: fulll hard question  (Read 18997 times)

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#### cuongt

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« Reply #15 on: August 18, 2006, 05:10:31 AM »
lol answer is 50. it was expected to be done in about 2-3 minutes.... how long did it take u guys?

#### M:B

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« Reply #16 on: July 28, 2007, 04:44:57 AM »
It is possible to answer the question within 3 minutes. Simply factorise the cubic equation (a3+b3+c3) and complete the square of the second degree equation for a2 + b2. Also place the linear equation in terms of (a + b). All three equations will then be expressed in terms of linear and second degree factors. c can then be found and through substituting the equations of a and b and the value of c into the quartic equation one will arrive at 50, even though values for a and b were never found.