Medium Math Class 9 Level 4

If x = -3 is a zero of x² + kx - 18 then what is k?

यदि x = -3 बहुपद x² + kx - 18 का शून्यक है तो k का मान क्या होगा?

A) -3 / -3 B) -2 / -2 C) 2 / 2 D) 3 / 3
Show answer and explanation
Correct Answer

A. -3 / -3

Explanation

Putting x = -3 gives 9 - 3k - 18 = 0, so -3k = 9 and k = -3.

x = -3 रखने पर 9 - 3k - 18 = 0 इसलिए -3k = 9 और k = -3।

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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