Solve 2x^33x-9 - ScanMath

Question

Simplify the expression

6 x^{4} - 9

Evaluate

2 x^{3} \times 3 x - 9

Solution

More Steps

Evaluate

2 x^{3} \times 3 x

Multiply the terms

6 x^{3} \times x

Multiply the terms with the same base by adding their exponents

6 x^{3 + 1}

Add the numbers

6 x^{4}

6 x^{4} - 9

Show Solution

Factor the expression

3 (2 x^{4} - 3)

Evaluate

2 x^{3} \times 3 x - 9

Multiply

More Steps

Evaluate

2 x^{3} \times 3 x

Multiply the terms

6 x^{3} \times x

Multiply the terms with the same base by adding their exponents

6 x^{3 + 1}

Add the numbers

6 x^{4}

6 x^{4} - 9

Solution

3 (2 x^{4} - 3)

Show Solution

Find the roots

x_{1} = - \frac{4 24}{2}, x_{2} = \frac{4 24}{2}

Alternative Form

x_{1} \approx - 1.106682, x_{2} \approx 1.106682

Evaluate

2 x^{3} \times 3 x - 9

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

2 x^{3} \times 3 x - 9 = 0

Multiply

More Steps

Multiply the terms

2 x^{3} \times 3 x

Multiply the terms

6 x^{3} \times x

Multiply the terms with the same base by adding their exponents

6 x^{3 + 1}

Add the numbers

6 x^{4}

6 x^{4} - 9 = 0

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

6 x^{4} = 0 + 9

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

6 x^{4} = 9

Divide both sides

\frac{6 x ^{4}}{6} = \frac{9}{6}

Divide the numbers

x^{4} = \frac{9}{6}

Cancel out the common factor 3

x^{4} = \frac{3}{2}

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

x = \pm 4 \frac{3}{2}

Simplify the expression

More Steps

Evaluate

4 \frac{3}{2}

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

\frac{4 3}{4 2}

Multiply by the Conjugate

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

Simplify

\frac{4 3 \times 4 8}{4 2 \times 4 2 ^{3}}

Multiply the numbers

More Steps

Evaluate

43 \times 48

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

4 3 \times 8

Calculate the product

424

\frac{4 24}{4 2 \times 4 2 ^{3}}

Multiply the numbers

More Steps

Evaluate

42 \times 4 2^{3}

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

4 2 \times 2^{3}

Calculate the product

4 2^{4}

Reduce the index of the radical and exponent with 4

2

\frac{4 24}{2}

x = \pm \frac{4 24}{2}

Separate the equation into 2 possible cases

x = \frac{4 24}{2} x = - \frac{4 24}{2}

Solution

x_{1} = - \frac{4 24}{2}, x_{2} = \frac{4 24}{2}

Alternative Form

x_{1} \approx - 1.106682, x_{2} \approx 1.106682

Show Solution