- Messages
- 3
- Reaction score
- 2
- Points
- 13
Plz help us with additional maths. Post ur problems! Anything you think will help us!
-
We need your support!
We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
Click here to Donate Now (View Announcement)
ADITIONAL MATHEMATICS! Lets start thread
- Thread starter IGCSEAKEEM
- Start date
- Messages
- 69
- Reaction score
- 57
- Points
- 28
Please visit http://drtayeb.com
- Messages
- 4
- Reaction score
- 0
- Points
- 11
Can anyone help me with May/June 2011 paper 11, question 11 (b) (iii):
g(x) = x^2+ 4,x >= 0,h(x) = 4x – 25, x >= 0.
Find the value of x for which gh(x) = 85?
Mark scheme:
g(4x−25)=85
(4x−25)^2 +4=85
x = 17/2 , x = 4
Discarding x = 4
I got x=17/2 and x=4 but I don't get why we have to discard x=4?
g(x) = x^2+ 4,x >= 0,h(x) = 4x – 25, x >= 0.
Find the value of x for which gh(x) = 85?
Mark scheme:
g(4x−25)=85
(4x−25)^2 +4=85
x = 17/2 , x = 4
Discarding x = 4
I got x=17/2 and x=4 but I don't get why we have to discard x=4?
- Messages
- 75
- Reaction score
- 42
- Points
- 28
I have a question here guys. When they say plot xy against x. Does that mean xy is at y axis and x is at x axis? Or otherwise
- Messages
- 16
- Reaction score
- 8
- Points
- 13
It means x first and y later