The graph<span> is shifted down k k units. Vertical Shift: Down 3 3 Units. The sign of a a</span>describes<span> the reflection across the </span>x<span>-axis. −a - a means the </span>graph<span> is reflected across the </span>x<span>-axis. Reflection about the </span>x<span>-axis: None. The value of a a </span>describes<span> the vertical stretch or compression of the</span>graph. a>1<span> a > </span><span>1</span>