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    5. Simplify the following expression: (5x + 7) 2  + (5x – 7) 2 .

    Question

    Simplify the following expression: (5x + 7) 2

     + (5x – 7) 2 .
    A 2(25x² + 49) Correct Answer Incorrect Answer
    B 2(25x² + 7) Correct Answer Incorrect Answer
    C (25x² + 7) Correct Answer Incorrect Answer
    D (25x² + 49) Correct Answer Incorrect Answer

    Solution

    (5x + 7) 2  + (5x – 7) 2 = 25x 2  + 49 + 70x + 25x 2  + 49 – 70x

    = 50x 2  + 98

    = 2(25x 2  + 49)

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