# Math Help - Linear approximation!

1. ## Linear approximation!

The linear approximation at x = 0 to f(x) = sqrt (7 + 7 x) is y =

any help will be appreciated!!

2. Originally Posted by frozenflames
The linear approximation at x = 0 to f(x) = sqrt (7 + 7 x) is y =

any help will be appreciated!!

http://www.mathhelpforum.com/math-he...gent-line.html

3. Originally Posted by skeeter

i use the same approach and get the following: .1889822x+2.64575

but it is incorrect. any thoughts?

4. Originally Posted by frozenflames
i use the same approach and get the following: .1889822x+2.64575

but it is incorrect. any thoughts?
first of all, put away the calculator.

what did you get for f'(x) ?

5. Originally Posted by skeeter
first of all, put away the calculator.