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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$\displaystyle \begin{gathered} f(x) = \left( {2x + 3} \right)^2 = 0 \hfill \\ \leftrightarrow x = - \frac{3} {2} \hfill \\ \end{gathered}$
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