Solve -40x^2 10x-28

Question

Simplify the expression

- 400 x^{3} - 28

Show Solution

- 4 (100 x^{3} + 7)

Show Solution

x = - \frac{3 70}{10}

Alternative Form

x \approx - 0.412129

Evaluate

- 40 x^{2} \times 10 x - 28

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

- 40 x^{2} \times 10 x - 28 = 0

Multiply

More Steps

- 400 x^{3} - 28 = 0

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

- 400 x^{3} = 0 + 28

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

- 400 x^{3} = 28

Change the signs on both sides of the equation

400 x^{3} = - 28

Divide both sides

\frac{400 x ^{3}}{400} = \frac{- 28}{400}

Divide the numbers

x^{3} = \frac{- 28}{400}

Divide the numbers

More Steps

x^{3} = - \frac{7}{100}

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

3 x^{3} = 3 - \frac{7}{100}

Calculate

x = 3 - \frac{7}{100}

Solution

More Steps

x = - \frac{3 70}{10}

Alternative Form

x \approx - 0.412129

Show Solution