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If the zero of (p(x)=ax+b) is (7) and (a=-4), what is (b)?यदि (p(x)=ax+b) का शून्यक (7) है और (a=-4), तो (b) क्या है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: 2828
Since 7 is a zero, p(7)=0. Therefore, 7a+b=0. Substituting a=-4 gives 7(-4)+b=0, or -28+b=0. Hence, b=28. The close distractor -28 is the value of 7a, not of b. Exam tip: if r is a zero of the linear polynomial ax+b, use ar+b=0 to find an unknown coefficient.शून्यक 7 होने का अर्थ है कि p(7)=0। अतः 7a+b=0। a=-4 रखने पर 7(-4)+b=0, यानी -28+b=0। इसलिए b=28। निकटतम भ्रम विकल्प -28 है, जो 7a का मान है, b का नहीं। परीक्षा टिप: रैखिक बहुपद ax+b के शून्यक r के लिए ar+b=0 लिखकर अज्ञात गुणांक ज्ञात करें।
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