Qualification > Math

Increasing and Decreasing funcitons....plzz help

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cashem'up:
yeah thanks alot..... i will wait....m really confused

nid404:

--- Quote from: ima_shah2002 on September 08, 2009, 02:49:50 pm ---yeah thanks alot..... i will wait....m really confused

--- End quote ---
is the ans to the first one 4 and -1...if yes, then i can explain

astarmathsandphysics:
Home in 20mins. Will do it then.

nid404:
Ok i guess im correct

1) Differentiate u get
6x2-18x-24
solve the quadratic u get
x=4 0r -1
so x>=4 and x<=-1 is the ans

2) differentiate u get
4x3-4x
4x(x2-1)
so -1<=x<=1

3) differentiate u get
3+3x2
3(1+x2)
f(x) increases with all x values

I hope you got it...I can't really explain maths well...but im pretty confident abt my answers...

nid404:
+ we can wait till astar gets home...he'll be able to explain it well and even confirm my answers if you doubt them...sometimes i doubt my answers...so we better wait and confirm...you needn't worry when astar's there to answer your doubts

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