Question

Rewrite the expression with positive exponents. $$(-9)^{0} x$$

Short answer

The expression (-9)^{0} x rewritten with positive exponents is x.

Step-by-step solution

Apply the rule of exponents

Firstly, apply the rule of exponents. This rule states that any number, except zero, raised to the power of zero equals one. Therefore. (-9)^{0} becomes 1.

Substitute into the expression

Once you have computed (-9)^{0} as 1, substitute it back into the original expression. This gives 1 \times x, which simplifies to x.

Key concepts

Exponents

Exponents are mathematical shorthand to express the repeated multiplication of the same number. For example, when we write \(5^3\), this means that we multiply the number 5 by itself three times: \(5 \times 5 \times 5\). This is a simple concept in theory, but exponents can sometimes lead to confusion when they involve zero or negative numbers.

The most fundamental rule to remember is that any non-zero number raised to the power of zero is always 1. This rule is crucial when simplifying expressions because it allows us to replace any instances of \(x^0\) with 1, which then simplifies the overall expression significantly. It's a powerful tool in algebra that streamlines complex expressions into more manageable forms.

Simplifying Expressions

Simplifying expressions is a fundamental skill in algebra that makes calculations easier and solutions clearer. To simplify an expression means to reduce it to its simplest form. This can involve combining like terms, simplifying exponents, and eliminating unnecessary elements. For example, when faced with an expression like \((-9)^0 \times x\), recognizing that any number raised to the zeroth power is 1 allows you to replace \((-9)^0\) with 1, simplifying the expression to \(1 \times x\), and finally just \(x\).

This process helps in solving equations, understanding function behavior, and performing other algebraic operations more efficiently. Simplification might not seem significant with smaller expressions, but when dealing with more complex algebraic functions, it is essential for managing and understanding the terms you're working with.

Algebraic Rules

Algebraic rules are the backbone of mathematics. These rules are the standardized methods that allow us to manipulate mathematical expressions and equations consistently. Some of the fundamental algebraic rules involve operations with exponents, such as the zero exponent rule we've seen, where any non-zero base raised to the zero power is 1. Other rules include the distributive property, the commutative and associative properties, and the rules for adding and multiplying polynomials.

The consistent application of these rules is key in solving algebraic problems correctly. Moreover, they allow us to transition from one equivalent expression to another, revealing different aspects of a problem that may be more useful in a given context. Understanding and correctly applying algebraic rules makes the study and application of mathematics more effective and can sometimes even reveal surprising relationships between otherwise disconnected mathematical ideas.