The following expression i am looking to confirm whether my answer is correct:
For the above expression my answer is
The book however has the answer as
Can anyone verify if i'm incorrect in my answer and why?
it's always good to have methods to check if your answers are right (because it in the real world you don't have a solution to check it against)
for example, here you could have evaluated the 3 expressions with a simple a such as 2:
so you could have now comfortably rejected the book's answer without verification from an authority figure.