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    Question

    What should come in place of the question mark (?) in the following questions?

    √10000 × √8100 - (50)² =

    √(?) + (80)²
    A 19600 Correct Answer Incorrect Answer
    B 16900 Correct Answer Incorrect Answer
    C 14400 Correct Answer Incorrect Answer
    D 10000 Correct Answer Incorrect Answer
    E 12000 Correct Answer Incorrect Answer

    Solution

    √10000 ×√8100 - (50)² = √(?) + (80)² => 100 × 90 - 2500 = √? + 6400 => 9000 - 2500 = √? + 6400 => √? = 6500 - 6400 => √? = 100 => ? = 10000

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