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PS - - - Funtions !!

by jiteshch » Fri Sep 18, 2009 10:05 pm
1)The function f is defined by f(x) = √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. √(u+10)
B. (√u + 10)2
C. √(u2+10)
D. (u + 10)2
E. (u2 + 10)2

OA Is D.
can somebody tell me the approach.
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by jiteshch » Sat Sep 19, 2009 5:37 am
OOps sorry just saw how d ques looks...

question again --
The function f is defined by f(x)= sqrt(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. sqrt(u+10)
B. (sqrt(u) + 10)^2
C. sqrt(u^2+10)
D. (u + 10)^2
E. (u^2 + 10)^2
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