general math MCQ #739

The value of (2.75)3 - (2.00)3 - (0.75)3 is__________?

general math MCQ #739

  1. Question 1

    Q1. The value of (2.75)3 - (2.00)3 - (0.75)3 is__________?

    • A) 3 * 2.75 * 2.75 * 2.75
    • B) 3 * 2.00 * 2.00 * 2.00
    • C) 3 * 2.75 * 0.75 * 2.75
    • D) 4.5 * 2.75

    Answer: 4.5 * 2.75

    Explanation: When a = b + c, the identity a³ − b³ − c³ = 3abc applies. Here 2.75 = 2 + 0.75, so the value = 3 × 2.75 × 2 × 0.75 = 12.375 = 4.5 × 2.75.