Question

f(x)=sqrt 2x-5
find f (27)

Answer 1

substitute x with 27 in f(x) .

Answer 2

27

Answer 3

try again?

Answer 4

f(27)=sqr root (2(27)-5)

Multiply 2 by the 27 inside the parentheses.
f(27)=sqr root (2*27-5)

Multiply 2 by 27 to get 54.
f(27)=sqr root (54-5)

Subtract 5 from 54 to get 49.
f(27)=sqr root (49)

Pull all perfect square roots out from under the radical. In this case, remove the 7 because it is a perfect square.
f(27)=7

Answer 5

@AravindG is 7 correct?

Answer 6

yep :)

Answer 7

yay!

Answer 8

@some_someone please do not give direct worked out answers like that .It is against Openstudy COC .Refer http://openstudy.com/code-of-conduct .Instead help the asker get to the solution ,making them participate in answering process.Thank you

Answer 9

Ok thank you @AravindG
I will follow that now :)