Solve 5r (9r^3 - 4)

Evaluate

5 r (9 r^{3} - 4)

To find the roots of the expression,set the expression equal to 0

5 r (9 r^{3} - 4) = 0

Elimination the left coefficient

r (9 r^{3} - 4) = 0

Separate the equation into 2 possible cases

r = 0 9 r^{3} - 4 = 0

Solve the equation

More Steps

r = 0 r = \frac{3 12}{3}

Solution

r_{1} = 0, r_{2} = \frac{3 12}{3}

Alternative Form

r_{1} = 0, r_{2} \approx 0.763143

Simplify the expression