The number of solutions of the equation 3x−1+5x−1=34
none of these
The correct option is B 1 It is very obvious that at x = 3 the given expression satisfies. Now, y=3x−1andy=5x−1 are both increasing function (exponential functions with base greater than 1). Therefore their sum y=3x−1+5x−1 is also an increasing function of x. It means for x < 3, y=3x−1+5x−1 < 34 and for x > 3, y=3x−1+5x−1 > 34.