Identity functions

Algebra Level 2

f f and g g are both identity functions

Find f ( 4 ) + g ( 99 ) f(4)+g(99)


The answer is 103.

Daniel Lim by Daniel Lim , 21, Singapore

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2 solutions

Divya Chaturvedi
Jun 29, 2014

If f(x) is an identity function then f(x)=x for all x

2 Helpful 0 Interesting 0 Brilliant 0 Confused
Kevin Patel
Jul 16, 2014

Let, f(4) + g(103) - g(4)... since f and g are identical, they cancels out remaining g(103).
Now, since g(103) has identical components, = 103(1) = 103

0 Helpful 0 Interesting 0 Brilliant 0 Confused

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