anonymous
  • anonymous
d^2y/dx^2 - 2 dy/dx - 15y = 0 given y(0) = 10 y^1(0) = -7
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
well the differential equation is: \[y''-2y'-15y=0, y(0)=10, y'(0)=-7\] it can be easily solved using the auxiliary equations
anonymous
  • anonymous
it's a 2nd order linear homogenous differential equation with constant co-efficents
anonymous
  • anonymous
\[m^2-2m-15=0 \implies (m-5)(m+3)=0 \implies m=5, m=-3\] the general solution is: \[y(x)=c_1e ^{5x}+c_2e^{-3x}\] now we have just to solve for the initial conditions

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anonymous
  • anonymous
can you do the rest?
anonymous
  • anonymous
I mean can you find c1 and c2? :)
anonymous
  • anonymous
m^2 -2m -15 =0 (m+3)(m-5) gives you two real root solutions hence y=Ae^-3x + Be^5x no use the intial values to find A & B am i on the right path
anonymous
  • anonymous
y= 57/8 e^-3x + 23/8 e^5x thats my answer
anonymous
  • anonymous
\[y'(x)=5c_1e ^{5x}-3c_2e ^{-3x} \implies y'(0)=5c_1-3c_2=10 \rightarrow (1)\] no need to continue... you got it already
anonymous
  • anonymous
your answer is perfectly right.. you still have one thing to do, which is to be a fan ;)
anonymous
  • anonymous
Try www.aceyourcollegeclasses.com

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