Solve 20x^(3)-25x^(2) 4x-5

Question

Simplify the expression

- 80 x^{3} - 5

Show Solution

- 5 (16 x^{3} + 1)

Show Solution

x = - \frac{3 4}{4}

Alternative Form

x \approx - 0.39685

Evaluate

20 x^{3} - 25 x^{2} \times 4 x - 5

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

20 x^{3} - 25 x^{2} \times 4 x - 5 = 0

Multiply

More Steps

20 x^{3} - 100 x^{3} - 5 = 0

Subtract the terms

More Steps

- 80 x^{3} - 5 = 0

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

- 80 x^{3} = 0 + 5

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

- 80 x^{3} = 5

Change the signs on both sides of the equation

80 x^{3} = - 5

Divide both sides

\frac{80 x ^{3}}{80} = \frac{- 5}{80}

Divide the numbers

x^{3} = \frac{- 5}{80}

Divide the numbers

More Steps

x^{3} = - \frac{1}{16}

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

3 x^{3} = 3 - \frac{1}{16}

Calculate

x = 3 - \frac{1}{16}

Solution

More Steps

x = - \frac{3 4}{4}

Alternative Form

x \approx - 0.39685

Show Solution