फलन (f(x)=x-2-10x+21) की रेंज क्या है?
What is the range of (f(x)=x-2-10x+21)?
Explanation opens after your attempt
A. \([-4,\infty\))
Concept
(x-2-10x+21=(x-5)2-4), so the minimum is (-4). In exams complete the square to find the range of a quadratic.
Why this answer is correct
The correct answer is A. \([-4,\infty\)). (x-2-10x+21=(x-5)2-4), so the minimum is (-4). In exams complete the square to find the range of a quadratic.
Exam Tip
(x-2-10x+21=(x-5)2-4), इसलिए न्यूनतम (-4) है। परीक्षा में quadratic की रेंज के लिए पूर्ण वर्ग बनाएं।
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