If x = 7 is a zero of x² - kx + 42 then what is k?
यदि x = 7 बहुपद x² - kx + 42 का शून्यक है तो k का मान क्या होगा?
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Correct Answer
C. 13 / 13
ExplanationPutting x = 7 gives 49 - 7k + 42 = 0 so 91 = 7k and k = 13.
x = 7 रखने पर 49 - 7k + 42 = 0 इसलिए 91 = 7k और k = 13।