The factorisation of \( 84-2 r-2 r^{2} \), is \( \begin{array}{ll}\text { (a) }(6-r)(r+7) & \text { (b) }(7-r)(r+6) \\ \text { (c) } 2(6-r)(r+7) & \text { (d) } 2(7-r)(r+\end{array} \)

В ар иант 2 1. Преобразуйте в многочлен. а) \( (x-6)^{2} ; \)

Enter the correct answer in the box. Rewrite the expression \( 2 \sqrt[4]{x^{7}} \) using rational exponents. \( \begin{array}{lll}\frac{\square}{\square} & \text { (ㅁ) } \mid \text { 미 } \square^{\square} \mid+--\end{array} \)

Find the value of \( m \) if \( \alpha+\beta=-2 \). (b) Seterusnya, bentukkan persamaan kuadratik dengan punca-punca \( \alpha \) dan \( \beta \). Hence, form a quadratic equation with roots \( \alpha \) and \( \beta \).

1. Найдите т \( y=x^{3}-48 x+14 \)

5. \( \left(16 x^{2}\right)^{-1} \)