What is (d^2)/(dx^2)(sqrt(x^2+81)) ?

The answer to (d^2)/(dx^2)(sqrt(x^2+81)) is (81)/((x^2+81)sqrt(x^2+81))

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(d^2)/(dx^2)(sqrt(x^2+81))

\frac{d ^{2}}{d x ^{2}} (x^{2} + 81)

\frac{81}{( x ^{2} + 81 ) x ^{2} + 81}

Solution steps

\frac{d ^{2}}{d x ^{2}} (x^{2} + 81)

\frac{d}{d x} (x^{2} + 81) = \frac{x}{x ^{2} + 81}

= \frac{d}{d x} (\frac{x}{x ^{2} + 81})

\frac{d}{d x} (\frac{x}{x ^{2} + 81}) = \frac{81}{( x ^{2} + 81 ) x ^{2} + 81}

= \frac{81}{( x ^{2} + 81 ) x ^{2} + 81}

\frac{d}{d x} (x^{3} e^{x})

\int \frac{1}{e ^{k x}} d x

y^{^{''}} + y = 0, y (0) = 0, y (π) = 0

y = 2 x + 1 (4.3)

\int x (x - 1)^{5} d x

What is (d^2)/(dx^2)(sqrt(x^2+81)) ?
The answer to (d^2)/(dx^2)(sqrt(x^2+81)) is (81)/((x^2+81)sqrt(x^2+81))