snowardemonimalame snowardemonimalame

21-11-2016
Mathematics

contestada

if f(x)={(3,5),(2,4),(1,7)} and g(x)=square root(x-3) what do i do to determine (f+g)(1) ...?

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HomertheGenius HomertheGenius

24-11-2016

( f + g ) ( 1 ) = f ( 1 ) + g ( 1 )
f ( 1 ) = 7
g ( 1 ) = √( 1- 3 ) = √( - 2 ) = √ 2 · √(-1 ) = i √ 2 ( we know that √(- 1 ) = i , or irrational number )
Answer:
( f + g ) ( 1 ) = 7 + i √ 2

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