Question

please solve this problem​

Answer 1

[1,2]

In such questions (objectives), just use the options to reach the answer. You can easily observe that among all the options, only option B involves 1 as the value of x. So, if 1 is the part of the interval in which x lies, then all other options except B will get eliminated. So, it would be a fine approach to check whether B is the answer or not, and "How can we check it ?" We can do this by substituting x as 1 and 2 in the expression, if the expression gives same value for both 1 and 2, then we are all done.

I went through the same approach and found that at x = 1 and x = 2, the expression gives same value, i.e., 27.

Hence, B is the correct answer for this particular problem.