Question

3^x+3^-x=2 solve the equation.​

Answer 1

3ˣ+3⁻ˣ=2

3ˣ+1/3ˣ=2

Let 3ˣ=y

y+1/y=2

y²+1=2y

y²-2y+1=0

(y-1)²=0

y=1

3ˣ=1

x=0