Question 955913
Find all values of x so that 6x, 4x-1, x^2-1 will be ab arithmetic sequence. 
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If they form an arithmetic sequence, the pairs must have a common difference.
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Equation:
difference of the 1st pair = difference of the 2nd pair
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(4x-1)-6x = (x^2-1)-(4x-1)
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-2x-1 = x^2-4x
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x^2 - 2x + 1 = 0
Factor:
(x-1)^2 = 0
x = 1
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Cheers,
Stan H.
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