Solve v^28v - 21 = 0

Evaluate

v^{2} \times 8 v - 21 = 0

Multiply

More Steps

8 v^{3} - 21 = 0

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

8 v^{3} = 0 + 21

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

8 v^{3} = 21

Divide both sides

\frac{8 v ^{3}}{8} = \frac{21}{8}

Divide the numbers

v^{3} = \frac{21}{8}

Take the 3 -th root on both sides of the equation

3 v^{3} = 3 \frac{21}{8}

Calculate

v = 3 \frac{21}{8}

Solution

More Steps

v = \frac{3 21}{2}

Alternative Form

v \approx 1.379462

Solve the equation