anonymous
  • anonymous
Find the linear approximation of the function f(x) = sqrt of (1 − x) at a = 0. Use L(x) to approximate the numbers sqrt of 0.9 and sqrt of 0.99. .
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
I already found L(X) = -1/2X + 1. Idk what do do after that.
myininaya
  • myininaya
\[\sqrt{1-x} \approx \frac{-1}{2}x+1\] \[\sqrt{0.9}=\sqrt{1-0.1} \approx \frac{-1}{2}(0.1)+1\]
anonymous
  • anonymous
Srry but where did u get sqrt of 1-0.1 from if x = 0.9

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myininaya
  • myininaya
.9=1-0.1
myininaya
  • myininaya
I was trying to find out what x was
myininaya
  • myininaya
x is 0.1 since we want to approximate sqrt(0.9)
anonymous
  • anonymous
Ok so for sqrt of 0.99 it wud be \[\sqrt{0.99} = \sqrt{1- 0.01} ~ -1/2 (0.01) + 1\]
myininaya
  • myininaya
You forgot the approximation symbol btw sqrt(1-0.01) and -1/2*(.01)+1 Also you should simplify -1/2*.01+1
anonymous
  • anonymous
so the approximation is 0.995 right?
anonymous
  • anonymous
So what is the general formula to write approxiamtions?
myininaya
  • myininaya
\[\frac{-1}{2} \cdot \frac{1}{100}+1 =\frac{-1}{2} \cdot \frac{1}{100}+\frac{200}{200}=\frac{200-1}{200}=\frac{199}{200} \text{ or } =.995\] So yes for sqrt(.99), that is a good approximation. To write linear approximations: Say we have a curve y=f(x) and we want to find the linear approximation at x=a for the numbers m. So we have: \[\text{ lines have this form: } y=mx+b\] Well we can find the general slope (aka derivative) for this curve. \[y'=f'(x)\] We actually wanted to know the slope at x=a That slope would in fact by y' evaluated at x=a So the slope of this tangent line is: \[y=f'(a)x+b\] We still need to find the y-intercept, b. We do know a point on this line (a, f(a)) We can input this point in to find b. So we have: \[f(a)=f'(a) \cdot a +b\] \[f(a)-f'(a) \cdot a =b \] So the tangent line to y=f(x) at x=a Or the equation we will use for linear approximations is: \[y=f'(a)x+f(a)-f'(a) \cdot a \] or you might prefer to write it as: \[y=f'(a) \cdot (x-a) +f(a)\] So anyways this is the linear approximation to y=f(x) for values near x=a. The approximations will get nastier the further your x is away from a. So we say: \[f(x) \approx f'(a)(x-a)+f(a) \text{ for values of x near x }\] This is the general form for linear approximations.
anonymous
  • anonymous
Are u typing a reply? or is this a glitch?
myininaya
  • myininaya
That slope m and that number m we want to use linear approximations on aren't the same. lol.
anonymous
  • anonymous
WOW THANK U SOO MUCH FOR SUCH A thorugh explanation :D
myininaya
  • myininaya
Let's say we want to approximate n instead of m. So we have that \[n=f( * ) \approx f'(a)(*-a)+f(a)\] What we input to approximate n depends on what the function is.
anonymous
  • anonymous
the star * symbol/ what does that represent in tha equation above
anonymous
  • anonymous
is it x?
myininaya
  • myininaya
* is the number I chose to show you that we are not inputting n but we are inputting in a value so that the function is the same as n for some value of x. Here I just chose that value of x to be *.
anonymous
  • anonymous
Oh I SEE. This makes alot more sense now. Thank u soo much for putting so much time into heloing me with this question . I appreciate it.
myininaya
  • myininaya
Np. I like linear approximations.
anonymous
  • anonymous
Thank u :) I might need help with more just b/c sum I find hard to differentiate
myininaya
  • myininaya
k. Post em separately just in case I'm away. I have chores to do :(.
anonymous
  • anonymous
NO PROBLEM :)

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