SOLUTION: Hi, I am hoping someone can help me with this equation: Let f(x) = 2x+5 and find a) f^-1 and b) 1/f(x)

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Question 111762This question is from textbook College Algebra
: Hi, I am hoping someone can help me with this equation:
Let f(x) = 2x+5 and find a) f^-1 and b) 1/f(x) This question is from textbook College Algebra

Answer by nihat(10) About Me  (Show Source):
You can put this solution on YOUR website!
Let f(x)= y = 2x+5
a) To find f^-1, first solve the above equation for x like this:
y - 5 = 2x
%28y+-+5%29%2F2 = x
Then label the y variable x and call the x variable f^-1 like this:
%28x+-+5%29%2F2 = f^-1
b) 1/f(x)= 1%2F%282x%2B5%29