Medium Math Class 9 Level 5

If x = 4 is a zero of x² - kx + 12 then what is k?

यदि x = 4 बहुपद x² - kx + 12 का शून्यक है तो k का मान क्या होगा?

A) 5 / 5 B) 6 / 6 C) 7 / 7 D) 8 / 8
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Correct Answer

C. 7 / 7

Explanation

Putting x = 4 gives 16 - 4k + 12 = 0 so 28 = 4k and k = 7.

x = 4 रखने पर 16 - 4k + 12 = 0 इसलिए 28 = 4k और k = 7।

Related Questions

Easy Math Class 10 Level 1

What is the area of a circle with radius 7 cm when π = 22/7?

7 सेमी त्रिज्या वाले वृत्त का क्षेत्रफल कितना होगा जब π = 22/7 हो?

A. 44 सेमी² / 44 cm² B. 77 सेमी² / 77 cm² C. 154 सेमी² / 154 cm² D. 308 सेमी² / 308 cm²
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