• Congratulations to the Class of 2024 on your results!
    Let us know how you went here
    Got a question about your uni preferences? Ask us here

Cambridge exercise 3A q)12 --------> Inequalities (1 Viewer)

SammyT123

Active Member
Joined
Nov 16, 2014
Messages
360
Gender
Male
HSC
2016
12.

If a>b and b is not equal to zero, prove:

a) -a<-b
b) ab^2 > b^3

I understand these questions (common sense :p) but how exactly would I do an official proof for them?

Thanks
-SammyT
 

InteGrand

Well-Known Member
Joined
Dec 11, 2014
Messages
6,109
Gender
Male
HSC
N/A
12.

If a>b and b is not equal to zero, prove:

a) -a<-b
b) ab^2 > b^3



I understand these questions (common sense :p) but how exactly would I do an official proof for them?

Thanks
-SammyT
Given:

a) Add to both sides of the above, and the desired inequality is reached.
b) (you can multiply an inequality through by a positive number, which is)
 

SammyT123

Active Member
Joined
Nov 16, 2014
Messages
360
Gender
Male
HSC
2016
Given:

a) Add to both sides of the above, and the desired inequality is reached.
b) (you can multiply an inequality through by a positive number, which is)
That's all?
That was my answer but it didn't seem right that a question would be this simple


Sent from my iPhone using Tapatalk
 

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

Top