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If n is a positive integer satisfying th...

If n is a positive integer satisfying the equation `2+(6*2^(2)-4*2)+(6*3^(2)-4*3)+"......."+(6*n^(2)-4*n)=140` then the value of n is

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To solve the equation \[ 2 + (6 \cdot 2^2 - 4 \cdot 2) + (6 \cdot 3^2 - 4 \cdot 3) + \ldots + (6 \cdot n^2 - 4 \cdot n) = 140, \] we can break it down step by step. ...
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