Q. Solve the equation.dxdy=8(xy)2+y2Choose 1 answer:(A) y=−16+Cx2+16(B) y=−x2+16+C16(C) y=−24+Cx3+24x(D) y=−x3+24x+C24
Identify Equation Type: This is a first-order non-linear ordinary differential equation. To solve it, we will try to separate the variables x and y if possible.
Rewrite Equation: First, let's rewrite the equation to make it clearer:dxdy=8x2y2+y2
Separate Variables: Now, we attempt to separate the variables by factoring out y2 on the right side:dxdy=y2(8x2+1)
Integrate Both Sides: Next, we divide both sides by y2 and multiply by dx to get:y2dy=(8x2+1)dx
Solve for y: Now we integrate both sides of the equation. On the left side, we integrate with respect to y, and on the right side, we integrate with respect to x:∫(y21)dy=∫(8x2+1)dx
Simplify Expression: The integral of y21 with respect to y is −y1. The integral of 8x2 with respect to x is 24x3, and the integral of 1 with respect to x is x. So we have:−y1=24x3+x+C, where y0 is the constant of integration.
Replace Constant: We solve for y by taking the reciprocal of both sides and multiplying by −1:y=−(24x3+x+C)1
Final Solution: We can simplify the expression by multiplying the numerator and denominator by 24 to clear the fraction in the denominator:y=−x3+24x+24C24
Final Solution: We can simplify the expression by multiplying the numerator and denominator by 24 to clear the fraction in the denominator:y=−x3+24x+24C24We can replace 24C with a new constant, let's call it C′, since it is still an arbitrary constant:y=−x3+24x+C′24
Final Solution: We can simplify the expression by multiplying the numerator and denominator by 24 to clear the fraction in the denominator:y=−x3+24x+24C24 We can replace 24C with a new constant, let's call it C′, since it is still an arbitrary constant:y=−x3+24x+C′24 This matches answer choice (D), so the solution to the differential equation is:y=−x3+24x+C′24
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