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natima [27]
3 years ago
7

If f(x)=3x+5/x, what is f(a+2)? A. 3(f(a))+5/f(a)+2 B. 3a+5/a+2 C. 3(a+2)+5/a+2

Mathematics
1 answer:
natali 33 [55]3 years ago
5 0

f(x) = 3x + 5/x

f(a + 2) = 3.(a + 2) + 5/(a + 2)

Alternative C.

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The range is the ouutput from inputing the input
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solve each
25=k²+2k+1
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factor
0=(k+6)(k-4)
set to zero
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64=k²+2k+1
minus 64 both sides
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facor
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set to zer
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k=7
k+9=0
k=-9
k=-9 or 7



so the domain has the numbers
-9,-6,4,7
it seems we only want the positive square roots so
answer is {4,7} is the domain
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