असमानता \(21-7x\le 0\) का हल क्या है?
What is the solution of the inequality \(21-7x\le 0\)?
Explanation opens after your attempt
A. \(x\ge 3\)
Concept
From \(21-7x\le 0\), we get \(-7x\le -21\), so \(x\ge 3\). The direction changes when dividing by a negative number.
Why this answer is correct
The correct answer is A. \(x\ge 3\). From \(21-7x\le 0\), we get \(-7x\le -21\), so \(x\ge 3\). The direction changes when dividing by a negative number.
Exam Tip
\(21-7x\le 0\) से \(-7x\le -21\), इसलिए \(x\ge 3\)। ऋणात्मक से भाग देने पर दिशा बदलती है।
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