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Friday, December 27, 2013

Solving 3rd Order Differential Equations

Category: Differential Equations, Integral Calculus

"Published in Newark, California, USA"

Find the general solution for


Solution:

Consider the given equation above


The given equation is a 3rd Order Differential Equation because the third derivative of y with respect to x is involved. We can rewrite given equation as follows



Multiply both sides of the equation by dx, we have




Integrate on both sides of the equation, we have




Rewrite the above equation as follows



Multiply both sides of the equation by dx, we have




Integrate on both sides of the equation, we have




Multiply both sides of the equation by dx, we have




Integrate on both sides of the equation, we have





where B = ½ C1. Therefore, the general solution is

      

Thursday, December 26, 2013

Solving 2nd Order Differential Equations

Category: Differential Equations, Integral Calculus

"Published in Newark, California, USA"

Find the general solution for


Solution:

Consider the given equation above


The given equation is a 2nd Order Differential Equation because the second derivative of y with respect to x is involved. We can rewrite given equation as follows



Multiply both sides of the equation by dx, we have




Integrate on both sides of the equation, we have







Multiply both sides of the equation by dx, we have




Integrate on both sides of the equation, we have



but



Hence, the above equation becomes







where B = C1 - 1.Therefore, the general solution is


Wednesday, December 25, 2013

Variable Separation, 5

Category: Differential Equations, Integral Calculus

"Published in Suisun City, California, USA"

Find the general solution for


Solution: 

Consider the given equation above


The given equation can be written as




Arrange the above equation by separation of variables, we have




Integrate on both sides of the equation, we have






Therefore, the general solution is


You can also eliminate their fraction by multiplying both sides of the equation by their Least Common Denominator (LCD) which is 4 as follows





Note: A constant multiply by another constant or coefficient is still a constant.