Medium Math Class 9 Level 6

If x = 5 is a zero of x² - kx + 20 then what is k?

यदि x = 5 बहुपद x² - kx + 20 का शून्यक है तो k का मान क्या होगा?

A 7 / 7 B 8 / 8 C 9 / 9 D 10 / 10
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Correct Answer

C. 9 / 9

Explanation

Putting x = 5 gives 25 - 5k + 20 = 0 so 45 = 5k and k = 9.

x = 5 रखने पर 25 - 5k + 20 = 0 इसलिए 45 = 5k और k = 9।

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