anonymous
  • anonymous
how do i integrate dx/sqrt(4-x)
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
Have you tried u substition?
anonymous
  • anonymous
substitution as in integration by parts?
anonymous
  • anonymous
for your question, do you mean \[\int\limits_{}^{}dx/\sqrt{4-x}\]

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anonymous
  • anonymous
yes thats exactly it. i am studying improper integrals so i need to find the regular integral first
anonymous
  • anonymous
Think of the square root on the bottom not as a square root, but as \[(4-x)^{1/2}\]
anonymous
  • anonymous
You will, however, have to use a u substitution, which is different the integration by parts. Integration by parts is only necessary in situations with multiplication or division of things you cannot simplify
anonymous
  • anonymous
More explicitly, think of it as \[\int\limits_{}^{}(4-x)^{-1/2}dx\]
anonymous
  • anonymous
okay, so then when you say substitute you mean, take (4-x) and substitute u. and then perform \[1/n+1\times u ^ {n+1} \]
anonymous
  • anonymous
sorry getting used to the equation typing
anonymous
  • anonymous
essentially yes. \[u = (4-x)\], and \[du/dx = -1\]. Substitute in u and du, integrate the function I wrote above, and replace (4-x) when you're done.
anonymous
  • anonymous
why is du/dx = -1?
anonymous
  • anonymous
when doing u substitutions, you substitute u, then take the derivative of what you substituted, in this case (4-x), for x, which = -1 in this case.
anonymous
  • anonymous
oh i see. so what i have then would be \[-1^{1/2}/{-1/2}\]
anonymous
  • anonymous
and that becomes -(u^1/2)/1 * 2/1 which is -2sqrt u. and that becomes -2sqrt(4-x) is that right?

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