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Summer Clouds moderators

08/08/2017 at 08:52
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If (2x − 5)(2x + 5) = 5, what is the value of \(4x^2\) ?




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    Kayasari Ryuunosuke Coordinator 08/08/2017 at 08:54

    (2x - 5)(2x + 5) = 5

    \(\Leftrightarrow\left(2x\right)^2-5^2=5\)

    \(\Leftrightarrow4x^2=5+25=30\)

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