Math Problem Statement
Roderick takes one look at the equation below and says there are no solutions. |x − 8| + 3 = −4Is he right, and what is his reasoning?A.Yes — absolute value equations cannot have negative numbers.B.Yes — the sum of an absolute value expression and a positive number cannot be negative.C.No — absolute value equations can have negative numbers.D.No — Roderick did not check for extraneous solutions.
Solution
Roderick is correct in saying that there are no solutions. The correct reasoning is:
B. Yes — the sum of an absolute value expression and a positive number cannot be negative.
Here’s why:
- The absolute value of any number, , is always non-negative (it is always ).
- Adding 3 to any non-negative number will result in a number that is greater than or equal to 3.
- Therefore, , and this sum can never equal -4.
Thus, it is impossible for the equation to have any solutions, because the left side will always be 3 or larger, while the right side is a negative number.
Would you like more details or have any questions?
Here are 5 related questions:
- What are the general steps to solve absolute value equations?
- Can the equation ever have solutions?
- How do you check for extraneous solutions in absolute value equations?
- What is the definition of absolute value in mathematics?
- Can an absolute value expression ever equal a negative number?
Tip: Always check whether the equation has a feasible range of values before solving. For absolute values, they cannot be negative!
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Math Problem Analysis
Mathematical Concepts
Absolute Value
Inequalities
Formulas
|x - a| + b ≥ b, where b > 0
Theorems
Absolute Value Theorem (Absolute values are always non-negative)
Suitable Grade Level
Grades 7-10