If x = 9 is a zero of x² - kx + 72 then what is k?
यदि x = 9 बहुपद x² - kx + 72 का शून्यक है तो k का मान क्या होगा?
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Correct Answer
C. 17 / 17
ExplanationPutting x = 9 gives 81 - 9k + 72 = 0 so 153 = 9k and k = 17.
x = 9 रखने पर 81 - 9k + 72 = 0 इसलिए 153 = 9k और k = 17।