Q. Solve the equation.dxdy=8x3y−8xyChoose 1 answer:(A) y=Ce2x4−4x2(B) y=e2x4−4x2+C(C) y=2x4−4x2+C(D) y=C(2x4−4x2)
Recognize type of differential equation: Recognize the type of differential equation.The given differential equation is of the form dxdy=f(x)y, which suggests it is a first-order linear homogeneous differential equation and can be solved using separation of variables or by recognizing it as a separable differential equation.
Separate variables: Separate variables.To solve the equation, we need to separate the variables y and x. We can do this by dividing both sides by y and then dividing by 8x3−8x to get the y terms on one side and the x terms on the other side.ydy=(8x3−8x)dx
Simplify the equation: Simplify the equation.We can factor out 8x from the right side to simplify the equation.ydy=8x(x2−1)dx
Integrate both sides: Integrate both sides.Now we integrate both sides of the equation to find the solution.∫(y1)(dy)=∫8x(x2−1)(dx)The left side integrates to ln∣y∣, and the right side requires integration by parts or recognizing it as a standard polynomial integral.ln∣y∣=∫8x3(dx)−∫8x(dx)ln∣y∣=2x4−4x2+C
Solve for y: Solve for y.To solve for y, we exponentiate both sides of the equation.eln∣y∣=e2x4−4x2+Cy=e2x4−4x2⋅eCSince eC is just a constant, we can denote it as C′.y=C′e2x4−4x2
Determine correct answer: Determine the correct answer from the given options.Comparing our solution to the answer choices, we see that our solution matches with option (A) if we consider C′ as Ce2x4−4x2.
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