Q. Solve the equation.dxdy=4yexChoose 1 answer:(A) y=eCex(B) y=eex+C(C) y=e4ex+C(D) y=Ce4ex
Recognize the equation type: Recognize that the given differential equation dxdy=4yex is a first-order linear differential equation that can be solved using the method of separation of variables.
Separate variables: Separate the variables by dividing both sides by y and multiplying both sides by dx to get y1dy = 4exdx.
Integrate both sides: Integrate both sides of the equation. The left side with respect to y and the right side with respect to x.∫(y1)dy=∫4e(x)dx
Perform integration: Perform the integration on both sides.The integral of y1dy is ln∣y∣, and the integral of 4exdx is 4ex.ln∣y∣=4ex+C, where C is the constant of integration.
Solve for y: Solve for y by exponentiating both sides to eliminate the natural logarithm.e(ln∣y∣)=e(4e(x)+C)∣y∣=e(4e(x))⋅e(C)
Exponentiate both sides: Since eC is just another constant, we can rename it as C′ (C prime) for simplicity.∣y∣=C′e4ex
Remove absolute value: Remove the absolute value by considering that y can be either positive or negative, so y=±C′e4ex. However, since C′ can absorb the negative sign, we can write y=C′e4ex.
Match with answer choices: Match the solution to the given answer choices.The correct answer choice that matches y=C′e4ex is (D) y=Ce4ex.
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