The question is:
Prove, by counter-example, that the statement: " ln (3x^2 + 5x + 3) > 0 for all real values of x " is FALSE.
What does the real values of x mean in this question?
I believe it means it can be any number, in this case a positive one, but not an i or j used in further maths, so for you just and positive number up to infinity whole number or decimal
Basically just means for all numbers from minus infinity to infinity. We say real x to distinguish from complex numbers.
Non-complex values of x (i.e. values of x that don't involve sqrt(-1)). If you haven't done FP1, then you have no need to even contemplate sqrt(-1), so don't worry about it, and just read it as "for all values of x". They just need to put the word "real" in there because otherwise some smartarse who's studied complex numbers will go and give a solution that the markers weren't expecting.
Oh so basically any number...! Thanks guys
Thanks for posting! You just need to create an account in order to submit the post
Already a member?
Oops, something wasn't right
please check the following:
Not got an account?
Sign up now
© Copyright The Student Room 2016 all rights reserved
The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.
Register Number: 04666380 (England and Wales), VAT No. 806 8067 22
Registered Office: International House, Queens Road, Brighton, BN1 3XE