Math Is Fun Forum

  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

You are not logged in.

#1 2016-12-22 19:36:45

Zeeshan 01
Member
Registered: 2016-07-22
Posts: 746

Question 2 :Functions 23 Dec ilmi

Question 1:   what is  A fuction from X to Y

Question 2 :  If function from x to y is a function then y €Y is called  ??

Question 3:  The function f (x)=ax^2+bx+c has Maximum  value if ?? And Minimum Value if???

Question 4: A function  from x to y  defined by f (x)=a,for all x €X and a €Y and fixed is called
Please help and mention question no thx


Malik

Offline

#2 2016-12-22 21:05:47

Bob
Administrator
Registered: 2010-06-20
Posts: 10,052

Re: Question 2 :Functions 23 Dec ilmi

hi Zeeshan 01

Q1.  I think this question is asking for the definition of a function.  You have the answer in your other post http://www.mathisfunforum.com/viewtopic.php?id=23613

I'll try to answer that question here.  You already have met the word domain.  X is the domain.  And Y is the codomain (or range).  The rule tells you what to do to any 'x' in order to get 'y'.  eg the rule could be 'square x' or find the 'sine of x'.

Q2.  I'm not sure what word is expected here.  If you look here: http://www.mathsisfun.com/sets/function.html  you'll see that y could be called the output of the function.  But you'll see, further down the page, other possible answers:  'range element', 'dependent variable', 'value of the function'.  I have also heard it called the 'image' of x.

Q3.  I f you go to this page: http://www.mathsisfun.com/data/function-grapher.php, you'll find a function grapher.  Choose values for 'a', 'b' and 'c' and you'll get a graph with either a maximum value or a minimum value (n shaped or U shaped curve).  Experiment with different values and you should be able to find that changing just one of the values switches the graph from maximum to minimum.

Q4.  Here the value of y never changes whatever you choose for x.  I'd call that a 'constant' function.

Hope that helps,

Bob


Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob smile

Offline

#3 2016-12-22 21:16:23

Zeeshan 01
Member
Registered: 2016-07-22
Posts: 746

Re: Question 2 :Functions 23 Dec ilmi

ALL ans in this Page http://www.mathsisfun.com/sets/function.html ???


Malik

Offline

Board footer

Powered by FluxBB