If 3x-1/2x=6 then the value of 9x2+1/4x2
please give answer with solution.

We have,3x - 12x = 6squaring both sides, we get     3x - 12x2 = 629x2 + 14x2 - 23x12x = 369x2 + 14x2 - 3 = 369x2 + 14x2 = 39

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