Solve 10x^21x-21 - ScanMath

Question

Simplify the expression

10 x^{3} - 21

Evaluate

10 x^{2} \times 1 \times x - 21

Solution

More Steps

Evaluate

10 x^{2} \times 1 \times x

Rewrite the expression

10 x^{2} \times x

Multiply the terms with the same base by adding their exponents

10 x^{2 + 1}

Add the numbers

10 x^{3}

10 x^{3} - 21

Show Solution

x = \frac{3 2100}{10}

Alternative Form

x \approx 1.280579

Evaluate

10 x^{2} \times 1 \times x - 21

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

10 x^{2} \times 1 \times x - 21 = 0

Multiply the terms

More Steps

Multiply the terms

10 x^{2} \times 1 \times x

Rewrite the expression

10 x^{2} \times x

Multiply the terms with the same base by adding their exponents

10 x^{2 + 1}

Add the numbers

10 x^{3}

10 x^{3} - 21 = 0

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

10 x^{3} = 0 + 21

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

10 x^{3} = 21

Divide both sides

\frac{10 x ^{3}}{10} = \frac{21}{10}

Divide the numbers

x^{3} = \frac{21}{10}

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

3 x^{3} = 3 \frac{21}{10}

Calculate

x = 3 \frac{21}{10}

Solution

More Steps

Evaluate

3 \frac{21}{10}

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

\frac{3 21}{3 10}

Multiply by the Conjugate

\frac{3 21 \times 3 1 0 ^{2}}{3 10 \times 3 1 0 ^{2}}

Simplify

\frac{3 21 \times 3 100}{3 10 \times 3 1 0 ^{2}}

Multiply the numbers

More Steps

Evaluate

321 \times 3100

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

3 21 \times 100

Calculate the product

32100

\frac{3 2100}{3 10 \times 3 1 0 ^{2}}

Multiply the numbers

More Steps

Evaluate

310 \times 3 1 0^{2}

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

3 10 \times 1 0^{2}

Calculate the product

3 1 0^{3}

Reduce the index of the radical and exponent with 3

10

\frac{3 2100}{10}

x = \frac{3 2100}{10}

Alternative Form

x \approx 1.280579

Show Solution