A parabola has the origin as its focus and the line \( x = 2 \) as the directrix. Then the vertex of the parabola is at:
If the system of linear equations \[ x + ky + 3z = 0, \quad 3x + ky - 2z = 0, \quad 2x + 4y - 3z = 0 \] has a non-zero solution \( (x, y, z) \), then \( \frac{xz}{y^2} \) is equal to:
The relationship between \( a \) and \( b \) so that the function \( f(x) \) defined by
is continuous at \( x = 3 \), is:
The local minimum value of the function \[ f(x) = 3 + |x|, \quad x \in \mathbb{R} \] is:
The equation of the hyperbola with vertices at
is: