Consider the curve given by the equation xy2−x3y=8. It can be shown that dxdy=2xy−x33x2y−y2.Write the equation of the vertical line that is tangent to the curve.
Q. Consider the curve given by the equation xy2−x3y=8. It can be shown that dxdy=2xy−x33x2y−y2.Write the equation of the vertical line that is tangent to the curve.
Set Denominator Equal to Zero: To find the vertical tangent, we need to set the denominator of the derivative dxdy equal to zero, because the slope of a vertical line is undefined, and this occurs when the denominator of the slope expression is zero.
Factor and Solve for x: The denominator of the derivative is 2xy−x3. Set this equal to zero to find the x-values where the tangent line could be vertical.2xy−x3=0
Check x=0: Factor out x from the equation.x(2y−x2)=0
Solve for y: Setting each factor equal to zero gives us the x-values where the tangent could be vertical.x=0 or 2y−x2=0
Substitute y into Original Equation: If x=0, then the equation 2y−x2=0 is automatically satisfied, so we don't get additional information from the second factor. We need to check if x=0 is indeed a point on the curve.
Simplify and Combine Terms: Substitute x=0 into the original equation xy2−x3y=8 to see if it yields a valid point on the curve.0⋅y2−03⋅y=80=8This is not true, so x=0 is not a point on the curve, and therefore cannot be where a vertical tangent occurs.
Solve for x5: Now, let's solve the second factor 2y−x2=0 for y to find the corresponding y-values for the vertical tangent.2y=x2y=21x2
No Real Solution: Substitute y=21x2 back into the original equation to find the x-values that satisfy both the original equation and the condition for a vertical tangent.x(21x2)2−x3(21x2)=8
No Real Solution: Substitute y=21x2 back into the original equation to find the x-values that satisfy both the original equation and the condition for a vertical tangent.x∗(21x2)2−x3∗(21x2)=8 Simplify the equation.x∗(41x4)−(21x5)=8(41x5)−(21x5)=8
No Real Solution: Substitute y=21x2 back into the original equation to find the x-values that satisfy both the original equation and the condition for a vertical tangent.x∗(21x2)2−x3∗(21x2)=8 Simplify the equation.x∗(41x4)−(21x5)=8(41x5)−(21x5)=8 Combine like terms.−(41x5)=8
No Real Solution: Substitute y=21x2 back into the original equation to find the x-values that satisfy both the original equation and the condition for a vertical tangent.x∗(21x2)2−x3∗(21x2)=8 Simplify the equation.x∗(41x4)−(21x5)=8(41x5)−(21x5)=8 Combine like terms.−(41x5)=8 Multiply both sides by −4 to solve for x5.x5=−32
No Real Solution: Substitute y=21x2 back into the original equation to find the x-values that satisfy both the original equation and the condition for a vertical tangent.x∗(21x2)2−x3∗(21x2)=8Simplify the equation.x∗(41x4)−(21x5)=8(41x5)−(21x5)=8Combine like terms.−(41x5)=8Multiply both sides by −4 to solve for x5.x5=−32Since x5=−32 has no real solution (as the fifth root of a negative number is not real), there are no x-values that satisfy the condition for a vertical tangent on the curve xy2−x3y=8. Therefore, there is no vertical line that is tangent to the curve.
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