New RBI Grade B 2025 Notification will come Soon! Enroll Here

    Question

    Two times a number, added to the square of that number,

    gives 3. What could be the possible answer for this number?
    A – 1 or – 3 Correct Answer Incorrect Answer
    B – 1 or 3 Correct Answer Incorrect Answer
    C 1 or 3 Correct Answer Incorrect Answer
    D 1 or – 3 Correct Answer Incorrect Answer

    Solution

    Let the number be x. According to question, ⇒ 2x + x2 = 3 ⇒ x2 + 2x – 3 = 0 ⇒ x2 – x + 3x – 3 = 0 ⇒ (x – 1)(x + 3) = 0 ⇒ x = 1, -3

    Practice Next

    Relevant for Exams: