AS-Level : Pure Maths - Functions

[Udam Senadheera]

Please!! Guyz, I need serious help in Pure Maths "Functions", I don't understand how do you derive to the range from the Domain and stuff.

E.g:- f(x) = x^2 + 4 (Domain : x is an element of all REAL Numbers)


Thanks in Advance

 

[anishh]

Please!! Guyz, I need serious help in Pure Maths "Functions", I don't understand how do you derive to the range from the Domain and stuff.

E.g:- f(x) = x^2 + 4 (Domain : x is an element of all REAL Numbers)


Thanks in Advance

dude domain of f= range of f inverse, so range of f inverse= (Domain : x is an element of all REAL Numbers),to find range of f:draw f(x) = x^2 + 4 by taking 2pts ie at x=0,fx= and fx=o,x= and find the lowest pt eg x=3,hence ans fx(>=)3.i hope it would help.

 

[Udam Senadheera]

dude domain of f= range of f inverse, so range of f inverse= (Domain : x is an element of all REAL Numbers),to find range of f:draw f(x) = x^2 + 4 by taking 2pts ie at x=0,fx= and fx=o,x= and find the lowest pt eg x=3,hence ans fx(>=)3.i hope it would help.

Thanks so You have to sketch a graph when you do it?