Problem

Multiply (6a^2)/(5b^2)*(45b^3)/(18a^3)

The problem is asking to perform multiplication between two fractions that contain both numerical coefficients and variables with exponents. Specifically, the first fraction is (6a^2)/(5b^2) and the second fraction is (45b^3)/(18a^3). The solution to the problem would involve multiplying the numerators (the top parts of the fractions) together and the denominators (the bottom parts of the fractions) together, simplifying where possible by canceling out common factors in the numerator and denominator, and applying the laws of exponents for the variables "a" and "b".

$\frac{6 a^{2}}{5 b^{2}} \cdot \frac{45 b^{3}}{18 a^{3}}$

Answer

Expert–verified

Solution:

Step 1:

Combine the fractions to form a single expression.

$$\frac{6a^2 \cdot 45b^3}{5b^2 \cdot 18a^3}$$

Step 2:

Reduce the fraction by eliminating common factors between numerator and denominator.

Step 2.1:

Identify and factor out the common factor between 6 and 18 in the numerator and denominator.

$$\frac{6(a^2 \cdot 45b^3)}{5b^2 \cdot 18a^3}$$

Step 2.2:

Proceed to simplify by canceling out the common factor.

Step 2.2.1:

Factor out the common factor of 6 in the denominator.

$$\frac{6(a^2 \cdot 45b^3)}{6(5b^2 \cdot 3a^3)}$$

Step 2.2.2:

Eliminate the common factor of 6.

$$\frac{\cancel{6}(a^2 \cdot 45b^3)}{\cancel{6}(5b^2 \cdot 3a^3)}$$

Step 2.2.3:

Simplify the expression after cancelation.

$$\frac{a^2 \cdot 45b^3}{5b^2 \cdot 3a^3}$$

Step 3:

Further reduce the expression by canceling out any additional common factors.

Step 3.1:

Factor out the common factor of $a^2$ in the denominator.

$$\frac{a^2 \cdot 45b^3}{a^2(5b^2 \cdot 3a)}$$

Step 3.2:

Cancel the common factor of $a^2$.

$$\frac{\cancel{a^2} \cdot 45b^3}{\cancel{a^2}(5b^2 \cdot 3a)}$$

Step 3.3:

Simplify the expression after cancelation.

$$\frac{45b^3}{5b^2 \cdot 3a}$$

Step 4:

Continue simplifying by canceling out common numerical factors.

Step 4.1:

Factor out the common factor of 5 in the numerator.

$$\frac{5 \cdot 9b^3}{5b^2 \cdot 3a}$$

Step 4.2:

Proceed to simplify by canceling out the common factor.

Step 4.2.1:

Factor out the common factor of 5 in the denominator.

$$\frac{5 \cdot 9b^3}{5(b^2 \cdot 3a)}$$

Step 4.2.2:

Eliminate the common factor of 5.

$$\frac{\cancel{5} \cdot 9b^3}{\cancel{5}(b^2 \cdot 3a)}$$

Step 4.2.3:

Simplify the expression after cancelation.

$$\frac{9b^3}{b^2 \cdot 3a}$$

Step 5:

Reduce the expression by canceling out common numerical factors.

Step 5.1:

Factor out the common factor of 3 in the numerator.

$$\frac{3 \cdot 3b^3}{b^2 \cdot 3a}$$

Step 5.2:

Proceed to simplify by canceling out the common factor.

Step 5.2.1:

Factor out the common factor of 3 in the denominator.

$$\frac{3 \cdot 3b^3}{3(b^2 \cdot a)}$$

Step 5.2.2:

Eliminate the common factor of 3.

$$\frac{\cancel{3} \cdot 3b^3}{\cancel{3}(b^2 \cdot a)}$$

Step 5.2.3:

Simplify the expression after cancelation.

$$\frac{3b^3}{b^2 \cdot a}$$

Step 6:

Finalize the simplification by canceling out any remaining common factors.

Step 6.1:

Factor out the common factor of $b^2$ in the numerator.

$$\frac{b^2 \cdot 3b}{b^2 \cdot a}$$

Step 6.2:

Cancel the common factors.

Step 6.2.1:

Eliminate the common factor of $b^2$.

$$\frac{\cancel{b^2} \cdot 3b}{\cancel{b^2} \cdot a}$$

Step 6.2.2:

Simplify the expression after cancelation.

$$\frac{3b}{a}$$

Knowledge Notes:

To solve the given problem, we apply the following knowledge points:

  1. Multiplication of Fractions: To multiply fractions, we multiply the numerators together and the denominators together.

  2. Simplifying Fractions: This involves canceling out common factors between the numerator and the denominator.

  3. Factoring: This is the process of breaking down numbers into their constituent prime factors or common factors.

  4. Cancelation: When a factor appears in both the numerator and the denominator, it can be canceled out from both, simplifying the fraction.

  5. Exponent Rules: When we have the same base with exponents in both the numerator and the denominator, we can subtract the exponents if we are dividing.

  6. LaTeX Formatting: Mathematical expressions are formatted using LaTeX syntax to clearly present the problem-solving process.

By applying these principles, we can simplify the given algebraic fraction to its simplest form.

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