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jooe's Question
Math
Posted 6 months ago
but why my answer is incorrect
why cannot multiply denominator to combine both side
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Answer from Sia
Posted 6 months ago
Solution by Steps
step 1
Consider the inequality problem you are working on. Let's denote it as abc \frac{a}{b} \leq c
step 2
To combine both sides by multiplying the denominator, you need to ensure that b b is positive. If b b is positive, you can multiply both sides by b b without changing the inequality direction: abc a \leq bc
step 3
If b b is negative, multiplying both sides by b b will reverse the inequality direction: abc a \geq bc
step 4
If b b is zero, the inequality is undefined because division by zero is not allowed
step 5
Therefore, you must check the sign of the denominator before multiplying both sides to combine them correctly
Answer
You cannot multiply the denominator to combine both sides without considering the sign of the denominator.
Key Concept
Sign of the denominator in inequalities
Explanation
When solving inequalities, the sign of the denominator determines whether the inequality direction changes or remains the same when multiplying both sides.

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