Solve 4x-72x^5 - ScanMath

Question

Factor the expression

4 x (1 - 18 x^{4})

Evaluate

4 x - 72 x^{5}

Rewrite the expression

4 x - 4 x \times 18 x^{4}

Solution

4 x (1 - 18 x^{4})

Show Solution

x_{1} = - \frac{4 72}{6}, x_{2} = 0, x_{3} = \frac{4 72}{6}

Alternative Form

x_{1} \approx - 0.485492, x_{2} = 0, x_{3} \approx 0.485492

Evaluate

4 x - 72 x^{5}

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

4 x - 72 x^{5} = 0

Factor the expression

4 x (1 - 18 x^{4}) = 0

Divide both sides

x (1 - 18 x^{4}) = 0

Separate the equation into 2 possible cases

x = 0 1 - 18 x^{4} = 0

Solve the equation

More Steps

Evaluate

1 - 18 x^{4} = 0

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

- 18 x^{4} = 0 - 1

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

- 18 x^{4} = - 1

Change the signs on both sides of the equation

18 x^{4} = 1

Divide both sides

\frac{18 x ^{4}}{18} = \frac{1}{18}

Divide the numbers

x^{4} = \frac{1}{18}

Take the root of both sides of the equation and remember to use both positive and negative roots

x = \pm 4 \frac{1}{18}

Simplify the expression

More Steps

Evaluate

4 \frac{1}{18}

To take a root of a fraction,take the root of the numerator and denominator separately

\frac{4 1}{4 18}

Simplify the radical expression

\frac{1}{4 18}

Multiply by the Conjugate

\frac{4 1 8 ^{3}}{4 18 \times 4 1 8 ^{3}}

Simplify

\frac{3 4 72}{4 18 \times 4 1 8 ^{3}}

Multiply the numbers

\frac{3 4 72}{18}

Cancel out the common factor 3

\frac{4 72}{6}

x = \pm \frac{4 72}{6}

Separate the equation into 2 possible cases

x = \frac{4 72}{6} x = - \frac{4 72}{6}

x = 0 x = \frac{4 72}{6} x = - \frac{4 72}{6}

Solution

x_{1} = - \frac{4 72}{6}, x_{2} = 0, x_{3} = \frac{4 72}{6}

Alternative Form

x_{1} \approx - 0.485492, x_{2} = 0, x_{3} \approx 0.485492

Show Solution