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function t in terms of u

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by bhumika.k.shah » Sun Jan 17, 2010 1:20 am
The function f is defined by f(x) =sq rt x -10 for all positive numbers x. If u = f(t) for some positive numbers t and u. What is t in terms of u?

A.root (u+10)
B. (root u + 10)^2
C.root (u^2+10)
D. (u + 10)^2
E. (u^2 + 10)^2


OA D

i got the answer by fluke :)
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by sanjayism » Sun Jan 17, 2010 8:58 am
Answer is D. (u + 10)^2
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by bhumika.k.shah » Sun Jan 17, 2010 9:03 am
yes but how did u get that answer ?
how to solve it ?
isnt that more important ???
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by sanjayism » Sun Jan 17, 2010 9:13 am
u = f(t)
=> u = sq rt(t)-10
=> u+10= sq rt(t)
=>t = (u+10)^2
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by bhumika.k.shah » Sun Jan 17, 2010 9:36 pm
yea even i got it later on!
thanks! :)
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