Q. y′=0.5(100−y)Is y=5e−0.5x+100 a solution to the above equation?Choose 1 answer:(A) Yes(B) No
Given Differential Equation: Given the differential equation y′=0.5(100−y), we need to verify if the function y=5e−0.5x+100 is a solution to this equation.
Differentiation of y: To verify if y=5e−0.5x+100 is a solution, we need to differentiate this function with respect to x and check if the derivative matches the right-hand side of the given differential equation.
Substitute into Equation: Differentiate y=5e−0.5x+100 with respect to x using the chain rule for the exponential function.y′=dxd[5e−0.5x]+dxd[100]y′=5∗(−0.5)∗e−0.5x+0y′=−2.5e−0.5x
Simplify Expression: Now, we substitute y=5e−0.5x+100 into the right-hand side of the given differential equation to see if it matches the derivative we found.Right-hand side of the differential equation: 0.5(100−y)=0.5(100−(5e−0.5x+100))
Compare Derivative: Simplify the right-hand side expression.0.5(100−(5e−0.5x+100))=0.5(100−5e−0.5x−100)0.5(−5e−0.5x)=−2.5e−0.5x
Compare Derivative: Simplify the right-hand side expression.0.5(100−(5e−0.5x+100))=0.5(100−5e−0.5x−100)0.5(−5e−0.5x)=−2.5e−0.5x Compare the derivative y′ with the simplified right-hand side of the differential equation.We found y′=−2.5e−0.5x and the right-hand side is also −2.5e−0.5x.Since both expressions are equal, y=5e−0.5x+100 is indeed a solution to the differential equation y′=0.5(100−y).