What will be the answer for this Share with your friends Share 0 Gursheen Kaur answered this 0 View Full Answer S Ramaratnam answered this 3^(x+2) + 3^(-x) = 10 3^(x) * 3^2 + 1/3^x = 10 let 3^x be y thus 9y + 1/y = 10 9y^2 +1 = 10y 9y^2 -10y + 1 = 0 9y^2 -9y -y +1 = 0 (9y -1)(y -1 ) = 0 thus y = 1/9 or 1 3^x = 1/9 or 1 thus x = -2 or 0 0