If 3x-1/2x=6 then the value of 9x2+1/4x2please give answer with solution. Share with your friends Share 0 Manbar Singh answered this We have,3x - 12x = 6squaring both sides, we get 3x - 12x2 = 62⇒9x2 + 14x2 - 23x12x = 36⇒9x2 + 14x2 - 3 = 36⇒9x2 + 14x2 = 39 3 View Full Answer