\(यदि (P_1={x:x\in \mathbb{N}\) और \(x^2-10x+21=0}), तो (P_1) कौन सा है\)?
\(If (P_1={x:x\in \mathbb{N}\) and \(x^2-10x+21=0}), which is (P_1)\)?
Explanation opens after your attempt
A. \(P_1={3,7}\)
Concept
Factorize \(x^2-10x+21=0\).
Why this answer is correct
((x-3)(x-7)=0), so (x=3,7).
Exam Tip
After finding solutions, check that they are natural numbers. चरण 1: समीकरण \(x^2-10x+21=0\) को गुणनखंड करें। चरण 2: ((x-3)(x-7)=0), इसलिए (x=3,7)। चरण 3: हल मिलने के बाद देखें कि वे प्राकृत संख्याएँ हैं या नहीं।
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