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Ch. P - Fundamental Concepts of Algebra
Blitzer - College Algebra 8th Edition
Blitzer8th EditionCollege AlgebraISBN: 9780136970514Non è quello che usi tu?Cambia libro di testo
Capitolo 1, Problema 63

Evaluate each algebraic expression for x = 2 and y = -5. |x|+|y|

Guida verificata passo dopo passo
1
Identify the given expression: \(|x| + |y|\), where \(x = 2\) and \(y = -5\).
Recall that the absolute value function \(|a|\) gives the non-negative value of \(a\), so \(|a| = a\) if \(a \geq 0\), and \(|a| = -a\) if \(a < 0\).
Calculate \(|x|\) by substituting \(x = 2\). Since 2 is positive, \(|2| = 2\).
Calculate \(|y|\) by substituting \(y = -5\). Since -5 is negative, \(|-5| = -(-5) = 5\).
Add the results: \(|x| + |y| = 2 + 5\).

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Concetti chiave

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Absolute Value

The absolute value of a number is its distance from zero on the number line, always expressed as a non-negative value. For example, |x| equals x if x is positive or zero, and -x if x is negative. This concept is essential for evaluating expressions like |x| + |y|.
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Substitution in Algebraic Expressions

Substitution involves replacing variables in an expression with given numerical values. Here, x and y are replaced with 2 and -5 respectively, allowing the expression to be evaluated numerically. This step is crucial for solving or simplifying algebraic expressions.
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Evaluating an algebraic expression means calculating its value after substituting variables with specific numbers. It requires following the order of operations and correctly applying arithmetic rules to find the final numerical result.
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