SOLUTION: Given the functions f(x)=x^2 and g(x)=sqrt(x),evaluate the following: (f+g)(7)= (f+g)(18)= (f+g)(-18)=

Algebra ->  Functions -> SOLUTION: Given the functions f(x)=x^2 and g(x)=sqrt(x),evaluate the following: (f+g)(7)= (f+g)(18)= (f+g)(-18)=       Log On


   

Question 1034678: Given the functions f(x)=x^2 and g(x)=sqrt(x),evaluate the following:
(f+g)(7)=
(f+g)(18)=
(f+g)(-18)=
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
We can use the identity
(f+g)(x) = f(x) + g(x) to solve all three...I'll do the first one, you do the rest the same way...notice sqrt(-18) isn't real...
(f+g)(7) = f(7) + g(7) = 49 + sqrt(7)
etc.