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    Question

    If (64)2 – (36)2 = 20Z, the

    value of z is 
    A 70 Correct Answer Incorrect Answer
    B 120 Correct Answer Incorrect Answer
    C 180 Correct Answer Incorrect Answer
    D None of these Correct Answer Incorrect Answer

    Solution

    ATQ ⇒  (64)2 - (36)2 = 20Z ⇒ 4096 - 1296 = 20Z ⇒ 20Z = 2800 ⇒ Z = 140

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