Questāo \( 8- \) Qual da alternativa abaixo é uma equação do \( 2^{\circ} \) grau: \( \begin{array}{l}\text { A. } 0 x^{2}+5 x-6=0 \\ \text { B. } 6 x+7=0 \\ \text { C. } x^{3}-4 x+1=0 \\ \text { D. } x^{2}-1 \\ \text { F. } x^{2}-2 x-2=0\end{array} \)

\( f(x)=5 x+6 ; g(x)=3 x-2 \) (h) Find \( \left(\left.\bar{g}\right|^{(1)}\right. \) \( \left(\frac{f}{g}\right)(1)=\square \) (Type an integer or a simplified fraction.)

15 It is given that \( t=\frac{b^{2}-4}{3-b^{2}} \). Express \( b \) in terms of \( t \)

Complete the square to write \( y=2 x^{2}+12 x-7 \) in graphing form. Then determine the vertex and the intercepts of the parabola. 1

Câu 01: (a) Cho hàm số \( f(x)=a x^{2}-\sqrt{2} \). Tìm \( a \) biết rằng \( (f \circ f)(\sqrt{2})=-\sqrt{2} \). (b) Tìm \( m \) để hàm số \( y=\sqrt{2 x-3 m+4}-\frac{x-m}{x+m-1} \) xác định với mọi \( x>0 \).

\( x^{2}-(k+3) x-7=0 \) seja igual a 8