Problem 116 - College Algebra

Question

Use the order of operations to simplify each expression. \(8-3[-2(5-7)-5(4-2)]\)

Step-by-Step Solution

Answer

The simplified form of the provided expression is 26.

Step 1: Start with Inner Parentheses

In the expression \(8-3[-2(5-7)-5(4-2)]\), the inner parentheses are the part which needs to be dealt first. Proceed to simplify: \(8-3[-2(-2)-5(2)]\).

Step 2: Simplify Inside Bigger Parenthesis

Now, we still have a bracket that needs to be simplified. Perform the multiplications within the bracket: \(8-3[4-10] = 8-3[-6]\).

Step 3: Solve Inside Remaining Bracket

Next, multiply the -3 by -6 within the outer parentheses: \(8-(-18)\).

Step 4: Complete with Final Operation

Finally, perform the subtraction operation: \(8+18=26\).

Key Concepts

Simplifying Algebraic Expressions

Simplifying algebraic expressions is essential for solving mathematics problems accurately and efficiently. It involves reducing expressions to their simplest form while adhering to the rules of arithmetic and algebra. You'll combine like terms, use the distributive property, and carry out operations within any grouping symbols, such as parentheses or brackets.

To understand this concept, let's look at the provided exercise: (8-3[-2(5-7)-5(4-2)]). The solution walks you through the process, starting from working out the operations inside the inner parentheses, then moving to the bigger parentheses, and finally carrying out the subtraction. By simplifying step by step, you end up with the most reduced form of the expression. Remembering to follow the order of operations ensures accuracy and avoids common mistakes.

Parentheses in Algebra

Parentheses play a critical role in algebra by signifying which parts of an expression should be handled first. This is known as the order of operations, or PEMDAS (Parentheses, Exponents, Multiplication and Division, Addition and Subtraction). When simplifying expressions that contain parentheses, such as in our example (8-3[-2(5-7)-5(4-2)]), it's important to start with the innermost parentheses and work outward.

This ensures that any operations contained within the parentheses are completed before those outside. It's like unwrapping a set of nested boxes; you start with the smallest box and work your way out. By following this rule, you preserve the integrity of the expression and get closer to the solution step by step.

Mathematical Operations

Mathematical operations form the basis of simplifying algebraic expressions. There is a specific sequence in which operations should be performed to achieve the correct answer, commonly referred to as the order of operations. In our example (8-3[-2(5-7)-5(4-2)]), you initially tackle the operations inside the parentheses, followed by multiplication and division from left to right, and finally, addition and subtraction.

It’s important to execute these operations accurately. Any deviation from the specified order can lead to different results, which are incorrect. By consistently applying the order of operations, you develop a mathematical discipline that helps in solving not only simple expressions but also more complex algebraic problems.