What is x in the equation: 2.2・0.997＾ｘ+21.8・0.707＾ｘ=0.114?

Answer 1

Though I haven't played around with the coefficients to see if this might be a special case, you will probably have to graph the function

f(x) = 2.2・0.997＾ｘ+21.8・0.707＾ｘ- 0.114 and look for its x-intercept to solve this equation.