Solve x^3y=18 - ScanMath

Solve the equation

Solve for x

Solve for y

x = \frac{3 18 y ^{2}}{y}

Show Solution

Testing for symmetry about the origin

Testing for symmetry about the x-axis

Testing for symmetry about the y-axis

Symmetry with respect to the origin

Show Solution

r = 4 18 sec^{3} (θ) csc (θ) r = - 4 18 sec^{3} (θ) csc (θ)

Show Solution

Find the derivative with respect to x

Find the derivative with respect to y

\frac{d y}{d x} = - \frac{3 y}{x}

Show Solution

Find the second derivative with respect to x

Find the second derivative with respect to y

\frac{d ^{2} y}{d x ^{2}} = \frac{12 y}{x ^{2}}

Calculate

x^{3} y = 18

Take the derivative of both sides

\frac{d}{d x} (x^{3} y) = \frac{d}{d x} (18)

Calculate the derivative

More Steps

3 x^{2} y + x^{3} \frac{d y}{d x} = \frac{d}{d x} (18)

Calculate the derivative

3 x^{2} y + x^{3} \frac{d y}{d x} = 0

Move the expression to the right-hand side and change its sign

x^{3} \frac{d y}{d x} = 0 - 3 x^{2} y

Removing 0 doesn't change the value,so remove it from the expression

x^{3} \frac{d y}{d x} = - 3 x^{2} y

Divide both sides

\frac{x ^{3} \frac{d y}{d x}}{x ^{3}} = \frac{- 3 x ^{2} y}{x ^{3}}

Divide the numbers

\frac{d y}{d x} = \frac{- 3 x ^{2} y}{x ^{3}}

Divide the numbers

More Steps

\frac{d y}{d x} = - \frac{3 y}{x}

Take the derivative of both sides

\frac{d}{d x} (\frac{d y}{d x}) = \frac{d}{d x} (- \frac{3 y}{x})

Calculate the derivative

\frac{d ^{2} y}{d x ^{2}} = \frac{d}{d x} (- \frac{3 y}{x})

Use differentiation rules

\frac{d ^{2} y}{d x ^{2}} = - \frac{\frac{d}{d x} ( 3 y ) \times x - 3 y \times \frac{d}{d x} ( x )}{x ^{2}}

Calculate the derivative

More Steps

\frac{d ^{2} y}{d x ^{2}} = - \frac{3 \frac{d y}{d x} \times x - 3 y \times \frac{d}{d x} ( x )}{x ^{2}}

Use \frac{d}{d x} x^{n} = n x^{n - 1} to find derivative

\frac{d ^{2} y}{d x ^{2}} = - \frac{3 \frac{d y}{d x} \times x - 3 y \times 1}{x ^{2}}

Use the commutative property to reorder the terms

\frac{d ^{2} y}{d x ^{2}} = - \frac{3 x \frac{d y}{d x} - 3 y \times 1}{x ^{2}}

Any expression multiplied by 1 remains the same

\frac{d ^{2} y}{d x ^{2}} = - \frac{3 x \frac{d y}{d x} - 3 y}{x ^{2}}

Use equation \frac{d y}{d x} = - \frac{3 y}{x} to substitute

\frac{d ^{2} y}{d x ^{2}} = - \frac{3 x ( - \frac{3 y}{x} ) - 3 y}{x ^{2}}

Solution

More Steps

\frac{d ^{2} y}{d x ^{2}} = \frac{12 y}{x ^{2}}

Show Solution