Thread: Linear approximation!

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


any help will be appreciated!!

Originally Posted by frozenflames

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


any help will be appreciated!!

see your other post ...

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

Originally Posted by skeeter

see your other post ...

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

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

but it is incorrect. any thoughts?

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.

your slope is wrong

what did you get for f'(x) ?

Originally Posted by skeeter

first of all, put away the calculator.

your slope is wrong

what did you get for f'(x) ?

I get 1/(2*sqrt (7+7x)

Originally Posted by frozenflames

I get 1/(2*sqrt (7+7x)

you forgot the chain rule ... bad juju!

ofcourse!! i'm forgetting the inner and multiply by 7