SOLUTION: (2x + 1)C3 - (2x-1)C3 - 2(xC2) NOTE: C stands for combination'

Question 1134492: (2x + 1)C3 - (2x-1)C3 - 2(xC2)
NOTE: C stands for combination'
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
(2x + 1)C3 - (2x-1)C3 - 2(xC2)
NOTE: C stands for combination'
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[(2x+1)(2x)(2x-1)/(1*2*3)] - [(2x-1)(2x-2)(2x-3)/(1*2*3)] - 2[x(x-1)/(1*2)]
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= [(2x+1)(2x)(2x-1) - (2x-1)(2x-2)(2x-3) - 3*2[x(x-1)]/6
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= [(2x-1)(4x^2+2x)-(4x^2-10x+6)]/6 -[x^2-x]
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etc.
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Cheers,
Stan H.
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