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(k/b + kb)(k^2/b^2 - k^2 + k^2 b^2) at a given b

The same question, asked 2 times: 26 Jul 2023 S3*, 11 Sep 2024 S3. Every wording below, oldest first.

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  1. Question 1

    26 Jul 2023 S3

    73
    If b = 5, determine the value of an expression (5b+5b)(25b2−25+25b2)\left(\frac{5}{b} + 5b\right)\left(\frac{25}{b^2} - 25 + 25b^2\right) using an identity.

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  2. Question 2

    11 Sep 2024 S3

    71
    Simplify the following expression. (3a+3a)(9a2−9+9a2) if a=1\left(\frac{3}{a} + 3a\right)\left(\frac{9}{a^2} - 9 + 9a^2\right) \text{ if } a = 1

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