ff(x). How To Work Out The Composite Function ff(x), The Same Funtion

In this video you will be shown how to find the composite function ff(x). This means you need to put the function f into itself.

So in example 1 the function f(x) is 5x+1 and you are asked to work out the function ff(x). To do this substitute x in one function to (5x+1), so ff(x) = 5(5x+1)+1. If you expand and simplify you get the final composite function ff(x)=25x+6.

In example 2 the function f(x) is x+3 and you need to work out the composite function ff(x). This time change the x in x+3 to x+3. So this will give a final answer of ff(x) = x+6.

[harbakshyadav]

Thank you so much sir❤ i'm from india..this is very helpful for me....❤❤

[Ro-fbsn]

If f(x) = 2x²+3
ff(x)= 2(2x²+3)²+3
Do we add square when x is in square?