Solve 28x^2/8x^3

$$\frac { 28 x ^ { 2 } } { 8 x ^ { 3 } }$$

Evaluate

$$\frac{7}{2x}$$

Steps for the Product of Two Exponentials

Use the rules of exponents to simplify the expression.

$$\left(28x^{2}\right)^{1}\times \frac{1}{8x^{3}}$$

To raise the product of two or more numbers to a power, raise each number to the power and take their product.

$$28^{1}\left(x^{2}\right)^{1}\times \frac{1}{8}\times \frac{1}{x^{3}}$$

Use the Commutative Property of Multiplication.

$$28^{1}\times \frac{1}{8}\left(x^{2}\right)^{1}\times \frac{1}{x^{3}}$$

To raise a power to another power, multiply the exponents.

$$28^{1}\times \frac{1}{8}x^{2}x^{3\left(-1\right)}$$

Multiply 3 times -1.

$$28^{1}\times \frac{1}{8}x^{2}x^{-3}$$

To multiply powers of the same base, add their exponents.

$$28^{1}\times \frac{1}{8}x^{2-3}$$

Add the exponents 2 and -3.

$$28^{1}\times \frac{1}{8}\times \frac{1}{x}$$

Raise 28 to the power 1.

$$28\times \frac{1}{8}\times \frac{1}{x}$$

Multiply 28 times \frac{1}{8}.

$$\frac{7}{2}\times \frac{1}{x}$$

Steps for Quotient of Exponentials

Use the rules of exponents to simplify the expression.

$$\frac{28^{1}x^{2}}{8^{1}x^{3}}$$

To divide powers of the same base, subtract the denominator's exponent from the numerator's exponent.

$$\frac{28^{1}x^{2-3}}{8^{1}}$$

Subtract 3 from 2.

$$\frac{28^{1}\times \frac{1}{x}}{8^{1}}$$

Reduce the fraction \frac{28}{8} to lowest terms by extracting and canceling out 4.

$$\frac{7}{2}\times \frac{1}{x}$$

Differentiate w.r.t. x

$$-\frac{7}{2x^{2}}$$

Solution Steps

To divide powers of the same base, subtract the denominator's exponent from the numerator's exponent.

$$\frac{\mathrm{d}}{\mathrm{d}x}(\frac{28}{8}x^{2-3})$$

Do the arithmetic.

$$\frac{\mathrm{d}}{\mathrm{d}x}(\frac{7}{2}\times \frac{1}{x})$$

The derivative of a polynomial is the sum of the derivatives of its terms. The derivative of a constant term is 0. The derivative of ax^{n} is nax^{n-1}.

$$-\frac{7}{2}x^{-1-1}$$

Do the arithmetic.

$$-\frac{7}{2}x^{-2}$$