Solve x^4 3x^2 - 28

Question

Simplify the expression

3 x^{6} - 28

Evaluate

x^{4} \times 3 x^{2} - 28

Solution

More Steps

Evaluate

x^{4} \times 3 x^{2}

Multiply the terms with the same base by adding their exponents

x^{4 + 2} \times 3

Add the numbers

x^{6} \times 3

Use the commutative property to reorder the terms

3 x^{6}

3 x^{6} - 28

Show Solution

x_{1} = - \frac{6 6804}{3}, x_{2} = \frac{6 6804}{3}

Alternative Form

x_{1} \approx - 1.451018, x_{2} \approx 1.451018

Evaluate

x^{4} \times 3 x^{2} - 28

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

x^{4} \times 3 x^{2} - 28 = 0

Multiply

More Steps

Multiply the terms

x^{4} \times 3 x^{2}

Multiply the terms with the same base by adding their exponents

x^{4 + 2} \times 3

Add the numbers

x^{6} \times 3

Use the commutative property to reorder the terms

3 x^{6}

3 x^{6} - 28 = 0

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

3 x^{6} = 0 + 28

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

3 x^{6} = 28

Divide both sides

\frac{3 x ^{6}}{3} = \frac{28}{3}

Divide the numbers

x^{6} = \frac{28}{3}

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

x = \pm 6 \frac{28}{3}

Simplify the expression

More Steps

Evaluate

6 \frac{28}{3}

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

\frac{6 28}{6 3}

Multiply by the Conjugate

\frac{6 28 \times 6 3 ^{5}}{6 3 \times 6 3 ^{5}}

Simplify

\frac{6 28 \times 6 243}{6 3 \times 6 3 ^{5}}

Multiply the numbers

More Steps

Evaluate

628 \times 6243

The product of roots with the same index is equal to the root of the product

6 28 \times 243

Calculate the product

66804

\frac{6 6804}{6 3 \times 6 3 ^{5}}

Multiply the numbers

More Steps

Evaluate

63 \times 6 3^{5}

The product of roots with the same index is equal to the root of the product

6 3 \times 3^{5}

Calculate the product

6 3^{6}

Reduce the index of the radical and exponent with 6

3

\frac{6 6804}{3}

x = \pm \frac{6 6804}{3}

Separate the equation into 2 possible cases

x = \frac{6 6804}{3} x = - \frac{6 6804}{3}

Solution

x_{1} = - \frac{6 6804}{3}, x_{2} = \frac{6 6804}{3}

Alternative Form

x_{1} \approx - 1.451018, x_{2} \approx 1.451018

Show Solution