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  4. If f(x) = ((3/5))x + ((4/5))x - 1, x ∈ R, then the equation f(x) = 0 has :

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Q. If $f\left(x\right) = \left(\frac{3}{5}\right)^{x} + \left(\frac{4}{5}\right)^{x} - 1, x \in R,$ then the equation $f\left(x\right) = 0$ has :

JEE MainJEE Main 2014Linear Inequalities

Solution:

Correct answer is (b) one solution

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