Lesson eLearning

If x = 2 is a root of x² - kx + 10 = 0, find k.

medium MCQ Class 8 · Mathematics · Linear Equations in One Variable
  1. k = 7
  2. k = 5
  3. k = -7
  4. k = 3
Answer
k = 7

The correct answer is k = 7 — 4 + 10 = 2k ⇒ 2k = 14 ⇒ k = 7.

Step-by-step solution

  1. Substitute x = 2: 2² - 2k + 10 = 0.
  2. 4 + 10 = 2k ⇒ 2k = 14 ⇒ k = 7.

Concept tested: Roots of Equation

Published · How this solution was prepared and checked

← All Linear Equations in One Variable questions