The factors of $18x^2-50$ are

Question

$\begin{array}{1 1} (a)\; 2(3x-5) (3x-5) \\ (b)\; 2(3x+5)(3x+5) \\ (c)\; 2(3x+5)(3x-5) \\ (d)\; -2(3x+5)(3x-5) \end{array}$