Solve 7x^2 4x-3 - ScanMath

Question

Simplify the expression

28 x^{3} - 3

Evaluate

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

Solution

More Steps

Evaluate

7 x^{2} \times 4 x

Multiply the terms

28 x^{2} \times x

Multiply the terms with the same base by adding their exponents

28 x^{2 + 1}

Add the numbers

28 x^{3}

28 x^{3} - 3

Show Solution

x = \frac{3 294}{14}

Alternative Form

x \approx 0.474957

Evaluate

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

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

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

Multiply

More Steps

Multiply the terms

7 x^{2} \times 4 x

Multiply the terms

28 x^{2} \times x

Multiply the terms with the same base by adding their exponents

28 x^{2 + 1}

Add the numbers

28 x^{3}

28 x^{3} - 3 = 0

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

28 x^{3} = 0 + 3

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

28 x^{3} = 3

Divide both sides

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

Divide the numbers

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

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

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

Calculate

x = 3 \frac{3}{28}

Solution

More Steps

Evaluate

3 \frac{3}{28}

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

\frac{3 3}{3 28}

Multiply by the Conjugate

\frac{3 3 \times 3 2 8 ^{2}}{3 28 \times 3 2 8 ^{2}}

Simplify

\frac{3 3 \times 2 3 98}{3 28 \times 3 2 8 ^{2}}

Multiply the numbers

More Steps

Evaluate

33 \times 2398

Multiply the terms

3294 \times 2

Use the commutative property to reorder the terms

23294

\frac{2 3 294}{3 28 \times 3 2 8 ^{2}}

Multiply the numbers

More Steps

Evaluate

328 \times 3 2 8^{2}

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

3 28 \times 2 8^{2}

Calculate the product

3 2 8^{3}

Reduce the index of the radical and exponent with 3

28

\frac{2 3 294}{28}

Cancel out the common factor 2

\frac{3 294}{14}

x = \frac{3 294}{14}

Alternative Form

x \approx 0.474957

Show Solution