What is the answer to 0=-(40)/(r^2)+4pir ?

The answer to 0=-(40)/(r^2)+4pir is

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0=-(40)/(r^2)+4pir

0 = - \frac{40}{r ^{2}} + 4 π r

Solution steps

0 = - \frac{40}{r ^{2}} + 4 π r

Multiply both sides by

r^{2}

0 = - 40 + 4 π r^{3}

Solve

Verify Solutions

Find undefined (singularity) points:

r = 0

Combine undefined points with solutions:

\frac{8}{y} + \frac{17}{y} = 5

\frac{1}{x ^{2}} a = 4

14 y + \frac{11}{2} = - \frac{12}{y}

\frac{100}{( 1 + x ) ^{1}} = - 102.9

\frac{6 x + 1}{x - 1} = 3