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Thread: [SOLVED] As Maths!

  1. #1
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    Exclamation [SOLVED] As Maths!

    please help

    (x) = 4x2 + 12x + C

    where C is a constant,

    given that f(x) = 0 has equal roots, find the value of C and hence solve f(x) = 0

    i've already found that C=9

    thanks in advance
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  2. #2
    Senior Member Peritus's Avatar
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    $\displaystyle \begin{gathered}
    f(x) = \left( {2x + 3} \right)^2 = 0 \hfill \\
    \leftrightarrow x = - \frac{3}
    {2} \hfill \\
    \end{gathered}$
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