$$ \begin{align*} \textbf{Izračunaj ove izraze } \\ &\ a) \frac{ -9 x^{2}+ 4 x - 42 }{(x- -9 )^{2}}= 0 \\ &\ b) \frac{ 42 x^{2}+ 4 x - 35 }{(x- 2 )^{2}}= 0 = 0 \\ &\ c) \binom{21}{x}\sum_{x}^{x+12} ( X+2X - 2x \cdot 4 ) \\ &\ d) X^{3} - 4 X - 4 + 42 X^{2}-\frac{1}{ 35 } X^{2} = 0 \\ &\ \end{align*} $$