Problem 96 - College Algebra

Question

Factor and simplify each algebraic expression. $$ 12 x^{-\frac{3}{4}}+6 x^{\frac{1}{4}} $$

Step-by-Step Solution

Answer

The factored and simplified form of the given algebraic expression is \(6 x^{-\frac{3}{4}} * (2 + x)\)

Step 1: Identify and factor out common terms

In the given expression, \(12 x^{-\frac{3}{4}}+6 x^{\frac{1}{4}}\), 6 is a common factor in the coefficients and \(x^{-\frac{3}{4}}\) is common in the variables (since \(x^\frac{1}{4}\) can be written as \(x^{-\frac{3}{4}} * x\). So, factor out 6 and \(x^{-\frac{3}{4}}\) from the given expression.

Step 2: Factor the expression

On factoring, the expression can be rewritten as: \(6 x^{-\frac{3}{4}} * (2 + x)\)

Step 3: Simplify the expression

The factored form \(6 x^{-\frac{3}{4}} * (2 + x)\) is the simplified expression.

Key Concepts

Common Factor

When dealing with algebraic expressions, finding the common factor is a crucial step in simplifying or factoring. A common factor refers to a number or variable (or both) that divides all terms in an expression evenly without leaving a remainder. In the expression given, \(12x^{-\frac{3}{4}} + 6x^{\frac{1}{4}}\), it's important to first look at the coefficients: 12 and 6. Both are divisible by 6. Similarly, when considering the variable part, observe the exponents. The smallest common exponent in the variables is \(-\frac{3}{4}\). By factoring out these common elements—a 6 and \(x^{-\frac{3}{4}}\)—we simplify the expression significantly.

Factoring out common terms:

• Helps simplify complex expressions
• Makes further arithmetic or algebraic operations easier
• Reveals hidden patterns or simpler structures in the expression

Thus, identifying and factoring out the common factor can transform an unwieldy expression into something far more manageable.

Exponents in Algebra

Exponents play a significant role in algebra, especially when it comes to expressions with multiple terms involving powers of variables. An exponent indicates how many times a number, known as the base, is multiplied by itself. For the expression \(12x^{-\frac{3}{4}} + 6x^{\frac{1}{4}}\), there are two terms that incorporate exponents: \(-\frac{3}{4}\) and \(\frac{1}{4}\).

Key aspects of exponents to remember include:

• Negative exponents imply the reciprocal of the base. For example, \(x^{-n} = \frac{1}{x^n}\).
• Fractional exponents represent roots, so \(x^{\frac{1}{n}}\) signifies the \(n\)-th root of \(x\).
• When multiplying terms with the same base, add the exponents, for instance: \(x^a \times x^b = x^{a+b}\). Use this rule when factoring.

Understanding these rules helps simplify and rearrange terms accurately, thereby aiding the factoring process that lacks straightforward numerical evaluation.

Simplifying Expressions

Simplifying expressions in algebra involves reducing them to their simplest form without changing their value. The goal is to make the expression as concise as possible, often by combining like terms and applying arithmetic rules. For the expression \(6x^{-\frac{3}{4}}(2 + x)\), once it is in factored form, it is considered simplified.

Steps to simplify expressions include:

• Factor out the greatest common factor from all terms to reduce complexity.
• Apply exponent rules to deal with variables consistently.
• Combine like terms if possible (though not continually relevant here).

By following these steps, the originally complex expression becomes easier to compute or apply in equations. Simplification not only aids in the direct calculation but also enhances overall algebraic intuition.