Q.1 (A)(i) If 3 is one of the root of the quadratic equation kx² - 7x + 12 = 0 , then k = ....................... A. 1 B. –1 C. 3 D. –3

Answer: A. 1 Answer: (A) 1 3 is a root, so it satisfies the equation. k(3)² - 7(3) + 12 = 0 ⇒ 9k - 21 + 12 = 0 ⇒ 9k = 9 ⇒ k = 1 .

If 3 is one of the root of the quadratic equation \(kx^2 - 7x + 12 = 0\), then \(k\) = .......................

Q.1 (A)(i) If 3 is one of the root of the quadratic equation \(kx^2 - 7x + 12 = 0\), then \(k\) = .......................

A. 1

B. –1

C. 3

D. –3

Doubtly Asked 25 Oct 2026 ssc 10th Save WhatsApp Report

Best answer

Answer: A. 1

Answer: (A) 1

3 is a root, so it satisfies the equation.

\(k(3)^2 - 7(3) + 12 = 0 \Rightarrow 9k - 21 + 12 = 0 \Rightarrow 9k = 9 \Rightarrow k = 1\).

Doubtly AI · 25 Oct 2026 AI-verified · Oct 2026 Report

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