Question

Which cube root function is always decreasing as x increases?

Of(x)=√√x-8
Of(x)=√x-5
O f(x)=√(5-x)
O f(x) = -√√x+5

Answer 1

Answer: option D

Explanation:

Answer 2

We shall proceed in graphical method

Graph all 4 functions

• Graph 4

Reason:-

It depends upon coefficient

In graph 4 the coefficient outside root is negative so it is decreasing