Homework Help: Math

Posted by Theo on Friday, May 27, 2011 at 11:38pm.

The product of three consecutive odd integers reduced by 23 is 99 less than the cube of the sum of the smallest number and 2. Compute the mean of the three integers.

Math - Reiny, Friday, May 27, 2011 at 11:45pm
let the 3 consecutive numbers be
x-2, x and x+2

(x-2)(x)(x+2) - 23 = (x-2 + 2)^3 - 99
x(x^2 - 4) - 23 = x^3 - 99
x^3 - 4x = x^3 - 99 + 23
-4x = -76
x = 19

the three numbers are 17, 19, and 21
and their mean is 19

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