Question

function f is defined by f (x)=2x-3 (iii) f(x)=x​

Answer 1

Step-by-step explanation:

Given: f(x) = 2^x - 3

So, if f(x) = 31, we can write: 2^x - 3 = 31

Add 3 to both sides to get: 2^x = 34 [solve this equation for x]

We know that 2^5 = 32

and 2^6 = 64

Since 34 lies between 32 and 64, we can conclude that x is between 5 and 6

Answer: E